Webster's English Dictionary

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caterpillar

cat.er.pil.lar \'kat-*(r)-.pil-*r\ n [ME catyrpel, fr. ONF catepelose, 
   lit., hairy cat] often attrib  : the elongated wormlike larva of a 
   butterfly or moth; also : any  of various similar larvaeCaterpillar tm : - 
   used for a tractor made for use on rough or soft ground and moved o n two 
   endless metal belts