Aculeus

·noun A Sting.

II. Aculeus ·noun A prickle growing on the bark, as in some brambles and roses.

aculeus
ăcūlĕus, i, m. [acc. to Prisc. 618 P. dim. from 1. acus, with the gender changed, like diecula fr. d...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
aculeus
aculeus ī, m acus, a sting : apis.—Meton., a point , L.—Fig., a sting, spur, goad : severitatis ...

An Elementary Latin Dictionary