Noun
string trimmer (plural string trimmers)
(horticulture) A powered, hand-held garden implement that uses a rotating monofilament line to cut grass, etc., without damaging other objects.
Synonyms: edge trimmer, line trimmer, (Britain) strimmer, (US) weed eater, (New Zealand, South Africa) weed whacker, weed whip, (Australia, Canada) whipper snipper