Any plant of the genus Polygonum, especially knotgrass.

(botany) Any of many plants, of the family Polygonaceae, embracing a large number of species, including bistort, knotweed, smartweed, etc.

(botany) Of or pertaining to a family of apetalous plants, Polygonaceae, of which the knotweeds of the genus Polygonum are the type, and which includes also the docks of the genus Rumex, the buckwheat, rhubarb, sea grape of the genus Coccoloba, and several other genera.

(rare) polygonal

polygonal

(obsolete) polygon

polygonal patches of ground, found especially in frozen environments. / polygonal patches of natural vegetation

(zoology) The state of being polygoneutic

plural of polygonial

(obsolete) An arrangement of hinged mirrors for the production of multiple images of an object.