Bear's-breech \Bear's"-breech`\, bear's-breeches \bear's"-breech`es\, n. 1. (Bot.) The English cow parsnip ({Heracleum sphondylium}) --Dr. Prior. [1913 Webster] 2. a widely cultivated southern European acanthus ({Acanthus mollis}) with whitish purple-veined flowers. See {Acanthus}, n., 1. Syn: bear's breech, bear's-breech, bear's breeches, sea holly. [WordNet 1.5]