What is "piperaceous"

Piperaceous \Pip`er*a"ceous\, a. [L. piper pepper.] (Bot.) Of or pertaining to the order of plants ( Piperace[ae]) of which the pepper ( Piper nigrum) is the type. There are about a dozen genera and a thousand species, mostly tropical plants with pungent and aromatic qualities.

a. (context botany English) Of or pertaining to the order of plants, ''Piperaceae'', of which the pepper is the type.