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Needlelike, as the leaves of pine; acerate.
acerose(ˈæsəˌrəʊs; -ˌrəʊz) (ˈæsəˌrəs) or
(Botany) shaped like a needle, as pine leaves
[C18: from Latin acerōsus full of chaff (erroneously used by Linnaeus as if derived from ācer sharp)]
needle-shaped, as the leaves of the pine.
[1775–85; misattribution of acer- to Latin acus needle, whose s. is acu- and not acer- (compare acute)]