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From The Collaborative International Dictionary of English v.0.48:
Mimosa \Mi*mo"sa\ (?; 277), n. [NL., fr. Gr. ? imitator. Cf. Mime.] (Bot.) A genus of leguminous plants, containing many species, and including the sensitive plants (Mimosa sensitiva, and Mimosa pudica). [1913 Webster] Note: The term mimosa is also applied in commerce to several kinds bark imported from Australia, and used in tanning; -- called also wattle bark. --Tomlinson. [1913 Webster]