7- and 8-letter words ending with the suffix -IUM with definitions
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126 total entries across 2 section(s)
Note: this list is built from spelling, not meaning. Some words here end with the right letters but do not really use the suffix in its usual sense. They are included on purpose: for Scrabble we suggest learning the suffix as a letter pattern rather than learning the meanings.
| FRONT | WORD | BACK | DEFINITION |
|---|---|---|---|
| — | ALODIUM | — | [n. -DIA] · allodium «land held in absolute ownership» - ALODIAL [a.] / [x] { allod allodium alodium § allodia alodia § allodial alodial } |
| — | BOHRIUM | S | [n. -S] · a radioactive element |
| — | CADMIUM | S | [n. -S] · a metallic element - CADMIC [a.] |
| — | CAESIUM | S | [n. -S] · cesium / [x] { caesium cesium § caesiums cesiums } |
| — | CALCIUM | S | [n. -S] · a metallic element |
| — | CAMBIUM | S | [n. -BIUMS or -BIA] · a layer of plant tissue |
| — | CRANIUM | S | [n. -NIUMS or -NIA] · the skull |
| — | DUBNIUM | S | [n. -S] · a radioactive element |
| — | ELUVIUM | S | [n. -VIA or -VIUMS] · a soil deposit |
| — | EXUVIUM | — | [n. -VIAE or -VIA] · the molted covering of an animal - EXUVIAL [a.] |
| — | FERMIUM | S | [n. -S] · a radioactive element |
| — | GALLIUM | S | [n. -S] · a metallic element |
| — | HAFNIUM | S | [n. -S] · a metallic element |
| — | HAHNIUM | S | [n. -S] · a radioactive element |
| — | HASSIUM | S | [n. -S] · a radioactive element |
| — | HOLMIUM | S | [n. -S] · a metallic element - HOLMIC [a.] |
| — | IRIDIUM | S | [n. -S] · a metallic element |
| — | ISCHIUM | — | [n. -CHIA] · a pelvic bone - ISCHIAL [a.] |
| — | LITHIUM | S | [n. -S] · a metallic element |
| — | MUONIUM | S | [n. -S] · an electron and a positive muon bound together |
| — | NATRIUM | S | [n. -S] · sodium |
| — | NIOBIUM | S | [n. -S] · a metallic element - NIOBIC NIOBOUS [a.] |
| — | PALLIUM | S | [n. -LIA or -LIUMS] · a cloak worn in ancient Rome~ |
| — | PREMIUM | S | [n. -S] · an additional payment |
| — | PROTIUM | S | [n. -S] · an isotope of hydrogen |
| — | RHENIUM | S | [n. -S] · a metallic element |
| — | RHODIUM | S | [n. -S] · a metallic element - RHODIC [a.] |
| — | STADIUM | S | [n. -S] · a structure in which athletic events are held |
| — | STIBIUM | S | [n. -S] · antimony |
| — | TERBIUM | S | [n. -S] · a metallic element - TERBIC [a.] |
| — | THORIUM | S | [n. -S] · a metallic element |
| — | THULIUM | S | [n. -S] · a metallic element |
| — | TRITIUM | S | [n. -S] · an isotope of hydrogen |
| — | TRIVIUM | S | [n. -IA or -IUMS] · a group of studies in medieval schools |
| — | URANIUM | S | [n. -S] · a radioactive element |
| — | UREDIUM | — | [n. -DIA] · a spore-producing~ organ of certain fungi |
| — | YTTRIUM | S | [n. -S] · a metallic element - YTTRIC [a.] |
| — | ZOARIUM | — | [n. -IA] · a colony of bryozoans - ZOARIAL [a.] |
| — | ZOECIUM | — | [n. -CIA] · zooecium «a sac secreted and lived in by an aquatic organism» |
| FRONT | WORD | BACK | DEFINITION |
|---|---|---|---|
| — | ACTINIUM | S | [n. -S] · a radioactive element |
| — | AECIDIUM | — | [n. -IA] · an aecium «a spore-producing~ organ of certain fungi» / [x] { aecidium aecium § aecia aecidia } |
| — | AEROBIUM | — | [n. -BIA] · aerobe «an organism that requires oxygen to live» |
| — | ALLODIUM | — | [n. -DIA] · land held in absolute ownership - ALLODIAL [a.] / [x] { allod allodium alodium § allodia alodia § allodial alodial } |
| — | ALLUVIUM | S | [n. -VIA or -VIUMS] · detrital material deposited by running water / [x] { alluvion alluvium § alluvia alluvions alluviums } |
| — | AMMONIUM | S | [n. -S] · a univalent chemical radical |
| — | APTERIUM | — | [n. -RIA] · a bare area of skin between feathers |
| — | AQUARIUM | S | [n. -IUMS or -IA] · a water-filled~ enclosure in which aquatic animals are kept |
| — | ASCIDIUM | — | [n. -DIA] · a flask-shaped~ plant appendage |
| — | BASIDIUM | — | [n. -IA] · a structure on a fungus - BASIDIAL [a.] |
| — | BDELLIUM | S | [n. -S] · a gum resin |
| — | BIENNIUM | S | [n. -NIA or -NIUMS] · a period of two years |
| — | BOTHRIUM | S | [n. -RIA or -RIUMS] · a groove on a tapeworm |
| — | BRACHIUM | S | [n. -IA or -S] · the upper part of arm (=brachiums) |
| — | CALADIUM | S | [n. -S] · a tropical plant |
| — | CHROMIUM | S | [n. -S] · a metallic element |
| — | CIBORIUM | S | [n. -RIA] · a vessel for holding holy bread |
| — | CONIDIUM | — | [n. -NIDIA] · a fungus spore - CONIDIAL CONIDIAN [a.] |
| — | COREMIUM | — | [n. -MIA] · an organ of certain fungi |
| — | CYATHIUM | — | [n. -ATHIA] · the flower head of certain plants |
| — | CYMATIUM | — | [n. -TIA] · a cyma «a curved molding» |
| — | DELIRIUM | S | [n. -IUMS or -IA] · wild excitement |
| — | DIDYMIUM | S | [n. -S] · a mixture of rare-earth~ elements |
| — | DILUVIUM | S | [n. -VIA or -VIUMS] · coarse rock material deposited by glaciers / [x] { diluvion diluvium § diluvia diluvions diluviums } |
| — | DISODIUM | — | [a.] containing two atoms of sodium per molecule |
| — | DOMINIUM | S | [n. -S] · the right of ownership and control of property |
| — | EMPORIUM | S | [n. -RIUMS or -RIA] · a trading or market center |
| — | ENCOMIUM | S | [n. -MIUMS or -MIA] · a eulogy |
| — | ERYNGIUM | S | [n. -S] · a plant of the parsley family |
| — | EULOGIUM | S | [n. -GIA° or -GIUMS] · a eulogy / [x] { eulogium eulogy § eulogia eulogies eulogiums } |
| — | EUROPIUM | S | [n. -S] · a metallic element |
| — | EXORDIUM | S | [n. -DIUMS or -DIA] · a beginning - EXORDIAL [a.] |
| — | FRANCIUM | S | [n. -S] · a radioactive element |
| — | FUSARIUM | S | [n. -SARIA or -SARIUMS] · a disease-causing~ fungus (=fusariums) |
| — | GERANIUM | S | [n. -S] · a flowering plant |
| — | GONIDIUM | — | [n. -IA] · an asexual reproductive cell - GONIDIAL GONIDIC [a.] |
| — | GYNECIUM | — | [n. -CIA] · the pistil of a flower |
| — | HELENIUM | S | [n. -S] · a plant with daisy-like~ flowers |
| — | HYMENIUM | S | [n. -NIA or -NIUMS] · a layer in certain fungi - HYMENIAL [a.] |
| — | ILLINIUM | S | [n. -S] · a radioactive element |
| — | ILLUVIUM | S | [n. -VIA or -VIUMS] · a type of material accumulated in soil - ILLUVIAL [a.] |
| — | IMPERIUM | S | [n. -RIUMS or -RIA] · absolute power |
| — | INDICIUM | S | [n. -S] · an indicia |
| — | INDUSIUM | — | [n. -SIA] · an enclosing membrane - INDUSIAL [a.] |
| — | LIMONIUM | S | [n. -S] · a sea plant of brightly colored funnel-like~ flowers |
| — | LIXIVIUM | S | [n. -IA or -IUMS] · a solution obtained by leaching - LIXIVIAL [a.] |
| — | LUTECIUM | S | [n. -S] · lutetium «a metallic element» / [x] { lutecium lutetium § luteciums lutetiums } |
| — | LUTETIUM | S | [n. -S] · a metallic element / [x] { lutecium lutetium § luteciums lutetiums } |
| — | MASURIUM | S | [n. -S] · a metallic element |
| — | MECONIUM | S | [n. -S] · the first fecal excretion of a newborn child |
| — | MYCELIUM | — | [n. -LIA] · the vegetative portion of a fungus - MYCELIAL MYCELIAN MYCELOID [a.] / [x] { mycele mycelium § myceles mycelia § mycelial mycelian myceloid } |
| — | NIHONIUM | S | † [n. -S] the synthetic transactinide chemical element with atomic number 113 |
| — | NOBELIUM | S | [n. -S] · a radioactive element |
| — | ONCIDIUM | S | [n. -S] · a tropical orchid |
| — | OOGONIUM | S | [n. -NIA or -NIUMS] · a female sexual organ in certain algae and fungi - OOGONIAL [a.] |
| — | PATAGIUM | — | [n. -GIA] · a wing membrane of a bat |
| — | PECULIUM | — | [n. -LIA] · private property |
| — | PEPONIUM | S | [n. -S] · pepo «a fruit having a fleshy interior and a hard rind» / [x] { pepo peponida peponium § peponidas peponiums pepos } |
| — | PERIDIUM | — | [n. -IA] · the covering of the spore-bearing~ organ in many fungi - PERIDIAL [a.] |
| — | POLONIUM | S | [n. -S] · a radioactive element |
| — | PROPRIUM | — | [n. -PRIA] · an attribute belonging inseparably to every member of a species |
| — | PSYLLIUM | S | [n. -S] · the seed of a fleawort |
| — | PUPARIUM | — | [n. -IA] · a pupal shell - PUPARIAL [a.] |
| — | PYGIDIUM | — | [n. -IA] · the posterior region of certain invertebrates - PYGIDIAL [a.] |
| — | PYXIDIUM | — | [n. -IA] · a type of seed vessel |
| — | REFUGIUM | — | [n. -GIA] · a stable area during a period of continental climactic change |
| — | ROSARIUM | S | [n. -IA or -IUMS] · a rose garden |
| — | RUBIDIUM | S | [n. -S] · a metallic element - RUBIDIC [a.] |
| — | SAMARIUM | S | [n. -S] · a metallic element |
| — | SCANDIUM | S | [n. -S] · a metallic element - SCANDIC [a.] |
| — | SCHOLIUM | S | [n. -LIA or -LIUMS] · an explanatory marginal note |
| — | SEDILIUM | — | [n. -LIA] · sedile «one of the seats in a church for the use of the officiating clergy» |
| — | SELENIUM | S | [n. -S] · a nonmetallic element - SELENOUS [a.] / [x] { selenium § seleniums § selenious selenous } |
| — | SILICIUM | S | [n. -S] · silicon / [x] { silicium silicon § siliciums silicons } |
| — | SOLARIUM | S | [n. -IA or -IUMS] · a room exposed to the sun |
| — | SOLATIUM | — | [n. -TIA] · a compensation given for damage to the feelings |
| — | SPLENIUM | S | [n. -NIA or -NIUMS] · a surgical bandage |
| — | SUDARIUM | — | [n. -IA] · a cloth for wiping the face |
| — | SYCONIUM | — | [n. -NIA] · a fleshy multiple fruit |
| — | THALLIUM | S | [n. -S] · a metallic element - THALLIC THALLOUS [a.] / [x] { thallium § thalliums § thallic thallious thallous } |
| — | TITANIUM | S | [n. -S] · a metallic element |
| — | TRILLIUM | S | [n. -S] · a flowering plant |
| — | UNUNBIUM | S | [n. -S] · a synthetic element |
| — | VANADIUM | S | [n. -S] · a metallic element - VANADIC VANADOUS [a.] |
| — | VELARIUM | — | [n. -IA] · an awning over an ancient Roman theater |
| — | VIVARIUM | S | [n. -IA or -IUMS] · a place for raising and keeping live animals / [x] { vivarium vivary § vivaria vivaries vivariums } |
| — | ZOOECIUM | — | [n. -CIA] · a sac secreted and lived in by an aquatic organism |
Copyright © 2026 Mitch Bayersdorfer · AGPL-3.0 · Thanks to Joe Petree for his definitions for these lists. · Detailed Attributions