The Collaborative International Dictionary
Ulmaceous
Ulmaceous \Ul*ma"ceous\, a. [L. ulmus an elm.] (Bot.) Of or pertaining to a suborder of urticaceous plants, of which the elm is the type.
Wiktionary
ulmaceous
a. (context botany English) Of or pertaining to the family Ulmaceae of flowering plants including the elm and zelkova.