mesembryanthemum Meaning, Definition & Usage

  1. noun South African annual or biennial plants having flowers that open only in bright sunlight
    genus Mesembryanthemum.

WordNet

Me*sem`bry*an"the*mum noun
Etymology
NL., fr. Gr. midday + flower.
Definitions
  1. (Bot.) A genus of herbaceous or suffruticose plants, chiefly natives of South Africa. The leaves are opposite, thick, and feshy. The flowers usually open about midday, whence the name.

Webster 1913