ăcĭdŭlus — Lewis & Short
ăcĭdŭlus, a, um, adj., dim. [acidus],
I a little sour, sourish, acidulous:
sapor,Plin. 15, 15, 16, § 54:
aqua,mineral water, id. 2, 103, 106, § 230; 31, 2, 5, § 9; so, fons, ib.