measuring worm

measuringworm

[mezh-er-ing-wurm]
noun
the larva of any geometrid moth, which progresses by bringing the rear end of the body forward and then advancing the front end.
Also, measuring worm.
Also called inchworm, looper, spanworm.


Origin:
1835–45, Americanism; measuring + worm

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World English Dictionary
measuring worm
 
n
looper, Also called: inchworm the larva of a geometrid moth: it has legs on its front and rear segments only and moves in a series of loops

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