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The Collaborative International Dictionary of English v.0.48 (gcide)

Inchworm \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}.
[1913 Webster]


Dropworm \Drop"worm`\ (dr[o^]p"w[^u]rm`), n. (Zool.)
The larva of any geometrid moth, which drops from trees by
means of a thread of silk, as the {cankerworm} or {inchworm}.
See {inchworm} and {geometrid}.
[1913 Webster]