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Definition of stick caterpillar in US English:
stick caterpillar
noun
1A caterpillar of a geometrid moth (family Geometridae), which resembles a stick or twig and typically holds itself erect and motionless on its prolegs when disturbed.
2†a stick insect (family Phasmida) (obsolete).
Origin
Mid 19th century; earliest use found in Gardeners' Chronicle.
