LATIN DICTIONARYLexicon Latīnum
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“weed” in Latin

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

weed s.
A noxious or useless plant, herba inutilis, sterilis, mala.
Weeds = mourning worn by widows, *cultus lugubris viduarum; *vestis lugubris qua viduae vestitae sunt.
weed v.
runcare: eruncare: inutiles herbas evellere: steriles herbas eligere: malas herbas effodere, sarrire (with the hoe). To weed a garden, hortum steriles herbas eligens repurgo: a weeding hoe, sarculum.

Quick answer

What is the Latin word for weed?
The usual Latin words for “weed” are sterilis, malus, runcō; also ēruncō, sarriō, sarculum. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.