(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
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
‖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 ]