inch·worm /ˈɪnʧˌwɚ/
  尺蠖
  Inch·worm n. Zool. The larva of any geometrid moth. It progresses forward by first bringing the rear end of the body forward, forming a loop, then moving the front part of the body; called also measuring worm,  measuringworm, spanner, and looper.  See Geometrid.
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  inchworm
       n : small hairless caterpillar having legs on only its front and
           rear segments; mostly larvae of moths of the family
           Geometridae [syn: measuring worm, looper]