'Polygonaceous' definitions:

Definition of 'Polygonaceous'

From: GCIDE

Polygonaceous \Pol`y*go*na"ceous\, a. [See Polygonum.] (Bot.) Of or pertaining to a natural order of apetalous plants (Polygonace[ae]), of which the knotweeds (species of Polygonum) are the type, and which includes also the docks (Rumex), the buckwheat, rhubarb, sea grape (Coccoloba), and several other genera. [1913 Webster]