tart (adj.) Copy link Outline I. Lit.1. ăcĭdus2. mordax, ācisII. Fig. • tart (adj.): I. Lit.: 1. ăcĭdus: v. acid, sour. 2. mordax, ācis: t. vinegar, m. acetum, Pers. 5, 86. II. Fig.: asper: v. pungent, biting.