ācrĭcŭlus, a, um, adj. dim. [2. acer],
somewhat sharp , testy : ille acriculus senex Zeno, Cic. Tusc. 3, 17, 38 (cf. acerbus, and the passage there quoted fr. Cic. N. D. 3, 31).
ācriculus adj. dim. 2 ācer, irritable : senex. ...
An Elementary Latin Dictionary