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 {M. pudica}). 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.