What is "rutaceous"

Rutaceous \Ru*ta"ceous\, a. [L. rutaceous, from ruta rue. See Rue the plant.] (Bot.) Of or pertaining to plants of a natural order ( Rutace[ae]) of which the rue is the type, and which includes also the orange, lemon, dittany, and buchu.

a. (context botany English) Of or relating to plants of the natural order Rutacae, of which the rue is the type, and which includes also the orange, lemon, dittany, and buchu.