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The Collaborative International Dictionary
Desinent

Desinent \Des"i*nent\, a. [L. desinens, p. pr. of desinere, desitum, to leave off, cease; de- + sinere to let, allow.] Ending; forming an end; lowermost. [Obs.] ``Their desinent parts, fish.''
--B. Jonson.

Wiktionary
desinent

a. (context obsolete English) Ending; forming an end; lowermost.