[mezh-er-ing-wurm] 
| the larva of any geometrid moth, which progresses by bringing the rear end of the body forward and then advancing the front end. |
| meas·ur·ing worm (mězh'ə-rĭng) n. A geometrid caterpillar that moves in alternate contractions and expansions suggestive of measuring. Also called inchworm, looper, spanworm. |
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