Definition of: ulmaceous

(ul·mā′shəs) adjective Bot.
Designating or belonging to a family (Ulmaceae) of shrubs and trees of the order Urticales, the elm family, widely distributed in temperate and tropical regions, and characterized by alternate simple leaves, apetalous bisexual or unisexual flowers, and a compressed fruit. [<NL, family name <L ulmus elm]