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There are 9 nine-letter words containing ONIUMS

AMMONIUMSammoniums n. Plural of ammonium.
AMMONIUM n. the ion NH4+, which occurs in the salts formed by ammonia and in ammonia solutions.
CORONIUMSCORONIUM 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.
LIMONIUMSLIMONIUM n. a sea plant with brightly coloured funnel-shaped flowers.
MECONIUMSmeconiums n. Plural of meconium.
MECONIUM n. the first fecal excretion of a newborn child.
NIHONIUMSNIHONIUM n. a highly radioactive element, of which only a few atoms have ever been produced.
OOGONIUMSoogoniums n. Plural of oogonium.
OOGONIUM n. a female sexual organ in algae and fungi.
OPSONIUMSOPSONIUM n. anything eaten with bread as a relish.
PEPONIUMSpeponiums n. Plural of peponium.
PEPONIUM n. a fruit having a fleshy interior and a hard rind, also PEPO, PEPONIDA.
POLONIUMSpoloniums n. Plural of polonium.
POLONIUM n. a rare highly radioactive metallic chemical element, present in some uranium ores.

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.

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See this list for:

  • English Wiktionary: 11 words
  • Scrabble in French: 4 words
  • Scrabble in Spanish: 1 word
  • Scrabble in Italian: no word
  • Scrabble in German: 2 words
  • Scrabble in Romanian: no word


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