List of 9-letter words containing

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There are 18 nine-letter words containing ONIUM

AMMONIUMS	• ammoniums n. Plural of ammonium. • AMMONIUM n. the ion NH4+, which occurs in the salts formed by ammonia and in ammonia solutions.
CARBONIUM	• carbonium n. (Dated, chemistry, deprecated) Any of several organic cations; carbocation or carbenium. • CARBONIUM n. a type of positively charged organic ion.
CORONIUMS	• CORONIUM n. the name given to a hypothetical element in the sun's corona showing spectral lines now known to be due to iron and nickel that have lost large numbers of electrons.
DIAZONIUM	• diazonium n. (Organic chemistry) any univalent cation, of general formula R-N₂⁺; diazonium salts are used to manufacture… • DIAZONIUM n. a group of diazo compounds used in the manufacture of certain dyes.
EUPHONIUM	• euphonium n. A valved brass instrument with conical tubing similar in appearance to a tuba but of higher pitch; a sax horn. • EUPHONIUM n. a musical instrument like a tuba but with somewhat higher pitch.
HARMONIUM	• harmonium n. (Music) A small keyboard instrument that consists of a series of reed pipes, which sound when one of… • HARMONIUM n. a keyboard instrument in which reeds are made to vibrate by air from a pedal-operated bellows.
HYDRONIUM	• hydronium n. (Inorganic chemistry) The hydrated hydrogen ion, H₃O⁺. • HYDRONIUM n. the hydrated hydrogen ion, H3O+.
LIMONIUMS	• LIMONIUM n. a sea plant with brightly coloured funnel-shaped flowers.
MECONIUMS	• meconiums n. Plural of meconium. • MECONIUM n. the first fecal excretion of a newborn child.
NIHONIUMS	• NIHONIUM n. a highly radioactive element, of which only a few atoms have ever been produced.
OOGONIUMS	• oogoniums n. Plural of oogonium. • OOGONIUM n. a female sexual organ in algae and fungi.
OPSONIUMS	• OPSONIUM n. anything eaten with bread as a relish.
PEPONIUMS	• peponiums n. Plural of peponium. • PEPONIUM n. a fruit having a fleshy interior and a hard rind, also PEPO, PEPONIDA.
PLUTONIUM	• plutonium n. The transuranic chemical element with atomic number 94 and symbol Pu: a silvery-gray fissile radioactive… • plutonium n. (Countable, historical) Alternative form of ploutonion. • PLUTONIUM n. a naturally radioactive, silvery, metallic transuranic element.
POLONIUMS	• poloniums n. Plural of polonium. • POLONIUM n. a rare highly radioactive metallic chemical element, present in some uranium ores.
PURDONIUM	• purdonium n. A coal scuttle. • PURDONIUM n. a kind of coal-scuttle introduced by a Mr Purdon.
SULFONIUM	• sulfonium n. (Inorganic chemistry) the univalent H₃S⁺ cation, derived from sulfane. • sulfonium n. (Organic chemistry) any derivative of this cation in which one or more hydrogen atoms are replaced by… • SULFONIUM n. the positively charged group SH3, its salts or derivatives, also SULPHONIUM.
ZIRCONIUM	• zirconium n. A chemical element (symbol Zr) with an atomic number of 40, a strong, lustrous, grey-white transition… • 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 1Word.ws and WikWik.org.

See this list for:

English Wiktionary: 47 words
Scrabble in French: 8 words
Scrabble in Spanish: 1 word
Scrabble in Italian: 1 word
Scrabble in German: 6 words
Scrabble in Romanian: no word

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