any tropical evergreen tree or shrub of the genus Rhizophora, having stiltlike intertwining aerial roots and growing below the highest tide levels in estuaries and along coasts, forming dense thickets: family Rhizophoraceae
b.
(as modifier)
mangrove swamp
2.
any of various similar trees or shrubs of the genus Avicennia: family Avicenniaceae
Word origin
C17 mangrow (changed through influence of grove), from Portuguese mangue, ultimately from Taino