(n) Old World annual widely naturalized in warm regions having white flowers and fleshy foliage covered with hairs that resemble ice, Syn. icicle plant, Mesembryanthemum crystallinum
‖n. [ NL., fr. Gr. meshmbri`a midday + 'a`nqos flower. ] (Bot.) A genus of herbaceous or suffruticose plants, chiefly natives of South Africa. The leaves are opposite, thick, and fleshy. The flowers usually open about midday, whence the name. [ 1913 Webster ]