WordReference Random House Unabridged Dictionary of American English © 2017
-oon, 
  • a suffix occurring in words borrowed from French and other Romance languages (bassoon;
    balloon;
    dragoon;
    pontoon
    ), and on this model occasionally used in the formation of new nouns in English (spittoon).
    • compare Spanish. -on, Italian. -one, Latin -ōn- as an English formative (e.g., in spittoon), extracted from words of various origins (buffoon, lagoon, etc.) but representing chiefly French -on in words stressed on the final syllable

    '-oon' also found in these entries:
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