polygonaceous

[ pol-ee-guh-ney-shuh s, puh-lig-uh-ney- ]
/ ˌpɒl i gəˈneɪ ʃəs, pəˌlɪg əˈneɪ- /

adjective

belonging to the Polygonaceae, the buckwheat family of plants.
Compare buckwheat family.

Origin of polygonaceous

1870–75; < New Latin Polygonace(ae) ( Polygon(um) the type genus (< Greek polýgonon knotgrass, literally, something with many joints; see poly-, knee, -gon) + -aceae -aceae) + -ous

British Dictionary definitions for polygonaceous

polygonaceous
/ (ˌpɒlɪɡəˈneɪʃəs, pəˌlɪɡə-) /

adjective

of, relating to, or belonging to the Polygonaceae, a chiefly N temperate family of plants having a sheathing stipule (ocrea) clasping the stem and small inconspicuous flowers: includes dock, sorrel, buckwheat, knotgrass, and rhubarb