Definition of alligator weed
: a prolific herbaceous weed (Alternanthera phylloxeroides) having opposite entire linear-lanceolate leaves and flowers in short headlike spikes and being especially troublesome in irrigation canals and waterways which it clogs with a dense floating mass
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Origin and Etymology of alligator weed
so called from its long narrow leaves
First Known Use: 1887See Words from the same year
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