Definitions for urticaceae
Urticaceae, family Urticaceae, nettle family(noun)
a family of plants of order Urticales including many nettles with stinging hairs
U.S. National Library of Medicine
The nettles plant family of the order Urticales, subclass Hamamelidae, class Magnoliopsida. Many have stinging hairs on stems and leaves. Flowers are small and greenish in leaf axils. The fruit is dry and one-seeded.