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There are 13 eleven-letter words containing ONIUM

ARCHEGONIUMarchegonium n. (Botany) A multicellular reproductive structure that contains a large, non-motile gamete (egg cell)…
ARCHEGONIUM n. the structure on the pteridophyte prothallus that produces the sessile female gametes.
CARPOGONIUMcarpogonium n. (Biology) The female organ in the red algae (Rhodophyta), having an elongated process which is the receptive…
CARPOGONIUM n. an egg-bearing vessel in red algae.
ERYTHRONIUMerythronium n. A plant of the genus Erythronium; a dogtooth violet.
erythronium n. (Obsolete) An early proposed name for vanadium.
Erythronium prop.n. A taxonomic genus within the family Liliaceae – the fawnlilies.
HORMOGONIUMhormogonium n. (Biology) A small, motile filament, formed by some cyanobacteria, that detaches and grows by cell division…
HORMOGONIUM n. a portion of a filament in many cyanobacteria that becomes detached as a reproductive body.
HYDROXONIUMhydroxonium n. (Chemistry) The cation obtained by reacting a proton with water - H3O+; hydronium.
HYDROXONIUM n. the obsolete name for the cation H3O+ derived from protonation of water.
PANDEMONIUMpandemonium n. A loud, wild, tumultuous protest, disorder, or chaotic situation, usually of a crowd, often violent.
pandemonium n. An outburst; loud, riotous uproar, especially of a crowd.
PANDEMONIUM n. riotous uproar, also PANDAEMONIUM.
PELARGONIUMpelargonium n. Any of various flowering plants of the genus Pelargonium, commonly called geraniums.
Pelargonium n. An extract of the rose geranium, Pelargonium sidoides, used as an alternative medicine.
Pelargonium prop.n. A taxonomic genus within the family Geraniaceae – the geraniums.
PHOSPHONIUMphosphonium n. (Chemistry) the tetravalent positively-charged phosphorus cation R4P+.
PHOSPHONIUM n. the radical PH4, analogous to ammonium.
POLEMONIUMSpolemoniums n. Plural of polemonium.
POLEMONIUM n. a genus of gamopetalous perennial herbs, including the Jacob's ladder and the Greek valerian.
POSITRONIUMpositronium n. (Physics, chemistry) An exotic atom (specifically, an onium) consisting of a positron (anti-electron)…
POSITRONIUM n. a positron and and an electron bound together in a short-lived unit, similar to a hydrogen atom.
SPOROGONIUMsporogonium n. The sporophyte of a bryophyte (moss, liverwort or hornwort), generally consisting of a foot, seta and capsule.
SPOROGONIUM n. an organ that produces asexual spores in mosses.
STRAMONIUMSstramoniums n. Plural of stramonium.
STRAMONIUM n. thorn apple, and its leaves used in medicine, also STRAMONY.
SULPHONIUMSsulphoniums n. Plural of sulphonium.
SULPHONIUM n. the positively charged group SH3, its salts or derivatives, also SULFONIUM.

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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See this list for:

  • English Wiktionary: 55 words
  • Scrabble in French: 5 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: no word
  • Scrabble in German: no word
  • Scrabble in Romanian: no word


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