any of several large, usually green, American long-horned grasshoppers, the males of which produce a characteristic song.

1745–55, Americanism; imitative

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World English Dictionary
katydid (ˈkeɪtɪˌdɪd)
any typically green long-horned grasshopper of the genus Microcentrum and related genera, living among the foliage of trees in North America
[C18: of imitative origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

insect of the locust family (Microsentrum rhombifolium), 1784, Amer.Eng. (perhaps first used by John Bartram), imitative of the stridulous sound the male makes when it rubs its front wings together.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The bug's strong back legs can propel the katydid into the air.
Closer inspection reveals a gorgeous, strikingly marked katydid hiding among the foliage.
The katydid is a leaflike insect which camouflages on leaves.
Image for katydid
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