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There are 12 nine-letter words containing IDIUM

COCCIDIUMcoccidium n. Synonym of coccidian.
COCCIDIUM n. a parasitic protozoan.
CORMIDIUMcormidium n. (Zoology) The colonial body of a compound animal.
CORMIDIUM n. (Latin) the assemblage of individuals dangling in clusters from the main stem of pelagic siphonophores.
CTENIDIUMctenidium n. (Zoology) A respiratory system, in the form of a comb, in some molluscs.
ctenidium n. (Zoology) A row of spines in some insects.
CTENIDIUM n. (Greek) a comblike anatomical structure.
CYMBIDIUMcymbidium n. (Botany) Any orchid of the genus Cymbidium.
Cymbidium prop.n. A taxonomic genus within the family Orchidaceae – boat orchids.
CYMBIDIUM n. a kind of tropical orchid.
ONCIDIUMSoncidiums n. Plural of oncidium.
ONCIDIUM n. any of a genus of tropical orchidaceous plants.
PERIDIUMSperidiums n. Plural of peridium.
PERIDIUM n. the outer coating of the spore carrier of a fungus.
PRESIDIUMpresidium n. A permanent executive committee, used primarily in Communist countries, with the power to act for a…
presidium n. Such an executive committee headed by the President of the Supreme Soviet.
PRESIDIUM n. (Latin) a standing committee in the former Soviet Union, also PRAESIDIUM.
PYCNIDIUMpycnidium n. In certain fungi, a flask-shaped cavity from the surface of the inner walls of which spores are produced.
PYCNIDIUM n. a spore-bearing organ in some fungi.
RHIPIDIUMrhipidium n. (Botany) A scorpioid cyme whose successive pedicels follow a zigzag path on the same plane.
RHIPIDIUM n. a fan-shaped cymose inflorescence.
RUBIDIUMSrubidiums n. Plural of rubidium.
RUBIDIUM n. a metallic element.
SPORIDIUMsporidium 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.
VENIDIUMSvenidiums n. Plural of venidium.
VENIDIUM n. a plant native to South Africa with yellow or cream flowers, aka Cape Daisy.

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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