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).
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How to use -oon in a sentence
Ever in oon, continually, constantly, always in the same way; cf. Cant.Chaucer's Works, Volume 1 (of 7) -- Romaunt of the Rose; Minor Poems | Geoffrey Chaucer
Item ij cloths of astate the oon richer then the other of cloth of gold.Mary Tudor, Queen of France | Mary Croom Brown
But the termination oon or n is suspicious in both cases, for it is not a genuine Irish suffix at all.English As We Speak It in Ireland | P. W. Joyce
S oon after, the squadron was reformed and the men entrenched themselves under fire.The Colored Regulars in the United States Army | T. G. Steward
Up roos tho oon of thise olde wise, and with his hand made contenaunce that men sholde holden hem stille, and yeven hym audience.Medieval People | Eileen Edna Power