Ac'er-ōse', a.

(Synop., § 130), a. [Lat. acerosus, chaffy, from acus, gen. acus, f., chaff, and N. Lat. acerosus, from acus, gen. acus, m., point, needle; Fr. aceré.] (Bot.) (a.) Having the nature of chaff; chaffy. (b.) Having the shape of a needle, as the leaf of the pine. Gray.