Ac″er‐ose′ (�), 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.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.