-oon
-oon conventional in 15c.-17c. English to add emphasis to borrowed French nouns ending in stressed -on; also used to represent It. -one, Sp. ón; all from L. -onem. Used in rare cases to form English words, e.g. SPITTOON (Cf. spittoon), OCTAROON (Cf. octaroon).

Etymology dictionary. 2014.

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