opil·i·a·ce·ae \ ̷ ̷ˌ ̷ ̷ ̷ ̷ˈāsēˌē\noun plural Usage: capitalized Etymology: New Latin, from Opilia, type genus + -aceae : a family of tropical shrubs or trees (order Santalales) having coriaceous leaves, small flowers, and drupaceous fruit • opil·i·a·ceous\ ̷ ̷| ̷ ̷ ̷ ̷|āshəs\adjective