Webster’s Revised Unabridged Dictionary · 1913
Desinent
Des′i·nent (dĕs′ĭ·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.