Webster’s Revised Unabridged Dictionary · 1913
Acerose
Ac′er·ose′ (ăs′ẽr·ōs′; 277), a. [(a) L. acerosus chaffy, fr. acus, gen. aceris, chaff; (b) as if fr. L. acus needle: cf. F. acéreux.] (Bot.) (a) Having the nature of chaff; chaffy. (b) Needle-shaped, having a sharp, rigid point, as the leaf of the pine.