Real Dictionary

mangrove
A mangrove or mangrove tree is a tree with roots which are above the ground and that grows along coasts or on the banks of large rivers in hot countries.

mangrove in American English
any of various coastal or aquatic tropical trees or shrubs, esp. of the mangrove family, that form large colonies in swamps or shallow water and provide a habitat for young fish and shrimp
designating a family (Rhizophoraceae, order Rhizophorales) of dicotyledonous trees and shrubs that inhabit tidal marshes and river mouths in the tropics
noun: any tropical tree or shrub of the genus Rhizophora, the species of which are mostly low trees growing in marshes or tidal shores, noted for their interlacing above-ground adventitious roots

mangrove in British English
noun: 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