What is "urticaceous"

Urticaceous \Ur`ti*ca"ceous\, a. (Bot.) Of or pertaining to a natural order ( Urticace[ae]) of plants, of which the nettle is the type. The order includes also the hop, the elm, the mulberry, the fig, and many other plants.

a. Of or pertaining to a natural order ''Urticaceae'' of plants, of which the nettle is the type.