noun, plural lamb's ears.
a hardy Middle Eastern plant, Stachys byzantina, of the mint family, having white, wooly leaves and small, purple flowers in dense whorls.
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British Dictionary definitions for lamb's ears
(functioning as singular) a perennial herb, Stachys lanata, planted for its foliage, which is covered with white woolly down; the purplish or striped flowers are smallAlso called: lamb's tongue, (Scot) lamb's lugs
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012