[adj] narrow and long and pointed; as pine leaves
\Ac"er*ose`\, a. [(a) L. acerosus chaffy, fr. acus, gen. aceris, chaff; (b) as if fr. L. acus needle: cf. F. ac['e]reux.] (Bot.) (a) Having the nature of chaff; chaffy. (b) Needle-shaped, having a sharp, rigid point, as the leaf of the pine.