mesembryanthemum

noun

me·​sem·​bry·​an·​the·​mum mə-ˌzem-brē-ˈan(t)-thə-məm 

: any of a genus (Mesembryanthemum) of chiefly southern African fleshy-leaved herbs or subshrubs of the carpetweed family

Word History

Etymology

New Latin, irregular from Greek mesēmbria midday (from mes- + hēmera day) + anthemon flower, from anthos — more at anthology

First Known Use

1753, in the meaning defined above