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There are 16 ten-letter words containing ONIUM

ASCOGONIUM	• ascogonium n. (Mycology) The spiral female organ of an ascomycetous fungus from which asci are produced. • ASCOGONIUM n. the female reproductive structure of fungi.
CARBONIUMS	• carboniums n. Plural of carbonium. • CARBONIUM n. a type of positively charged organic ion.
CHARMONIUM	• charmonium n. (Physics) Any meson formed from a charm quark and its antiquark. • CHARMONIUM n. any of various elementary particles consisting of a charm quark and an antiquark.
DIAMMONIUM	• diammonium n. (Inorganic chemistry) Two ammonium ions in a compound.
DIAZONIUMS	• diazoniums n. Plural of diazonium. • DIAZONIUM n. a group of diazo compounds used in the manufacture of certain dyes.
EUPHONIUMS	• euphoniums n. Plural of euphonium. • EUPHONIUM n. a musical instrument like a tuba but with somewhat higher pitch.
HARMONIUMS	• harmoniums n. Plural of harmonium. • HARMONIUM n. a keyboard instrument in which reeds are made to vibrate by air from a pedal-operated bellows.
HYDRONIUMS	• hydroniums n. Plural of hydronium. • HYDRONIUM n. the hydrated hydrogen ion, H3O+.
PERIGONIUM	• perigonium n. (Botany) The sterile parts of a flower; collectively, the sepals and petals (or tepals); the perianth. • perigonium n. (Botany) The modified leaves around the antheridia in a bryophytic plant. • perigonium n. (Dated, zoology) The wall of the sporosac in a hydroid.
PLUTONIUMS	• plutoniums n. Plural of plutonium. • PLUTONIUM n. a naturally radioactive, silvery, metallic transuranic element.
POLEMONIUM	• polemonium n. Any of the genus Polemonium of gamopetalous perennial herbs. • Polemonium prop.n. A taxonomic genus within the family Polemoniaceae – Jacob’s ladder and related flowering plants. • POLEMONIUM n. a genus of gamopetalous perennial herbs, including the Jacob's ladder and the Greek valerian.
PURDONIUMS	• purdoniums n. Plural of purdonium. • PURDONIUM n. a kind of coal-scuttle introduced by a Mr Purdon.
STRAMONIUM	• stramonium n. The jimsonweed plant. • stramonium n. A narcotic drug obtained from the dried leaves of this plant. • Stramonium prop.n. (Archaic) A taxonomic genus within the family Solanaceae – possibly only consisting of the species now…
SULFONIUMS	• sulfoniums n. Plural of sulfonium. • SULFONIUM n. the positively charged group SH3, its salts or derivatives, also SULPHONIUM.
SULPHONIUM	• sulphonium n. Alternative spelling of sulfonium. • SULPHONIUM n. the positively charged group SH3, its salts or derivatives, also SULFONIUM.
ZIRCONIUMS	• zirconiums n. Plural of zirconium. • ZIRCONIUM n. a rare element of the carbon-silicon group.

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.

See this list for:

English Wiktionary: 52 words
Scrabble in French: 6 words
Scrabble in Spanish: no word
Scrabble in Italian: no word
Scrabble in German: no word
Scrabble in Romanian: no word

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