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There are 11 words ending with RIDIUM

IRIDIUM	• iridium n. (Uncountable) A chemical element (symbol Ir) with an atomic number of 77: a very hard, brittle, silvery-white… • iridium n. (Countable) A single atom of this element. • IRIDIUM n. a metallic element.
PERIDIUM	• peridium n. (Mycology) The outer layer that covers the spore-bearing organ in many fungi. • PERIDIUM n. the outer coating of the spore carrier of a fungus.
SPORIDIUM	• sporidium n. (Botany) A secondary spore borne on a promycelium, or a filament produced from a spore, in certain kinds… • sporidium n. An ascospore. • sporidium n. Any spore.
NEPHRIDIUM	• nephridium n. (Biology) A tubular excretory organ in some invertebrates. • nephridium n. (Anatomy) The embryonic excretory organ that develops into the kidney. • NEPHRIDIUM n. in invertebrates and lower chordates, an organ serving the function of a kidney.
OSMIRIDIUM	• osmiridium n. (Mineralogy) A hard, corrosion-resistant alloy of osmium and iridium, used in pen nibs. • OSMIRIDIUM n. a very hard corrosion-resistant white or grey natural alloy of osmium and iridium, also IRIDOSMINE, IRIDOSMIUM.
ANTHERIDIUM	• antheridium n. (Botany, mycology) An organ producing male gametes called antherozoids, found in some algae, ferns, and bryophytes. • ANTHERIDIUM n. the male reproductive organ of some plants, also ANTHERID.
CLOSTRIDIUM	• clostridium n. Any of several mostly anaerobic gram-positive bacteria, of the genus Clostridium, that are present in… • Clostridium prop.n. A taxonomic genus within the family Clostridiaceae – the clostridium bacteria. • CLOSTRIDIUM n. any of a genus of spore-forming mostly anaerobic soil or intestinal bacteria.
HESPERIDIUM	• hesperidium n. Any of several kinds of true berries, including citrus fruit such as the lemon and lime, which have… • HESPERIDIUM n. a plant with a berry like a citrus fruit.
SPHAERIDIUM	• sphaeridium n. (Zoology) A sense organ found on the exterior of most sea urchins, consisting of an oval or spherical… • SPHAERIDIUM n. a minute spheroidal body on the surface of a sea urchin, perhaps a sense organ.
PLATINIRIDIUM	• platiniridium n. (Chemistry, mineralogy) A natural alloy of platinum and iridium occurring in grayish metallic rounded… • PLATINIRIDIUM n. an alloy of platinum and iridium.
CRYPTOSPORIDIUM	• cryptosporidium n. Any protozoan of the genus Cryptosporidium, intestinal parasites of humans and other vertebrates that… • Cryptosporidium prop.n. A taxonomic genus within the family Cryptosporidiidae – coccidian protozoan parasites causing the disease… • CRYPTOSPORIDIUM n. any of a genus of protozoans parasitic in the gut of vertebrates including humans and sometimes causing diarrhea.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the WikWik.org and 1Word.ws.

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English Wiktionary: 29 words
Scrabble in French: 4 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: 1 word
Scrabble in Romanian: 1 word

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