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HYPHEN
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY

polygonum

Noun

po=lyg=o=num

WORDNET DICTIONARY

polygonum(n = noun.plant) genus polygonum - diverse genus of herbs or woody subshrubs of north temperate regions; Array

is a kind of dicot genus, magnoliopsid genus

is a member of buckwheat family, family polygonaceae, polygonaceae

polygonum, n. [NL., fr. Gr. a kind of plant; poly`s many + go`ny the knee, a joint of a plant. So called in allusion to the numerous joints.].

A genus of plants embracing a large number of species, including bistort, knotweed, smartweed, etc. [1913 Webster]

polygonum, n. any plant of the genus Polygonum, with small bell-shaped flowers. Also called KNOTGRASS, KNOTWEED.

Etymology

mod.L f. Gk polugonon

For further exploring for "polygonum" in Webster Dictionary Online