Etymology
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weed (n.)

"plant not valued for use or beauty," Old English weod, uueod "grass, herb, weed," from Proto-Germanic *weud- (source also of Old Saxon wiod, East Frisian wiud), of unknown origin. Also applied to trees that grow abundantly. Meaning "tobacco" is from c. 1600; that of "marijuana" is from 1920s. The chemical weed-killer is attested by 1885.

weed (v.)

"to clear the ground of weeds," late Old English weodian "to weed," from the source of weed (n.). Figurative use by c. 1400. Related: Weeded; weeding; weeder.

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Definitions of weed
1
weed (n.)
any plant that crowds out cultivated plants;
weed (n.)
a black band worn by a man (on the arm or hat) as a sign of mourning;
Synonyms: mourning band
weed (n.)
street names for marijuana;
Synonyms: pot / grass / green goddess / dope / gage / sess / sens / smoke / skunk / locoweed / Mary Jane
2
weed (v.)
clear of weeds;
weed the garden
From wordnet.princeton.edu