Webster's English Dictionary

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moth

moth \'mo.th\ \'mo.thz, 'mo.ths\ n or moths [ME mothe, fr. OE moththe; akin 
   to MHG motte moth] pl  1: CLOTHES MOTH  2: a usu. nocturnal insect (order 
   Lepidoptera) with mostly feathery antenna e and a stouter body, less 
   brilliant coloring, and proportionately smaller wings than the butterflies 
   and with larvae that are plant-eating caterpillars