† leptynticMed.Obs.|lɛpˈtɪntɪk| Also leptuntic. [ad. late L. leptyntic-us, a. Gr. λεπτυντικ-ός, f. λεπτύνειν to make thin, f. λεπτός thin.] An attenuant. 1721Bailey, Leptunticks, attenuating cutting Medicines which Part the Crass and viscous Humours, with their acute Particles.