'Katydid' definitions:
Definition of 'katydid'
From: WordNet
noun
Large green long-horned grasshopper of North America; males produce shrill sounds by rubbing together special organs on the forewings
Definition of 'Katydid'
From: GCIDE
- Katydid \Ka"ty*did`\, n. (Zool.) A large, green, arboreal, orthopterous insect ({Cyrtophyllus concavus}) of the family Locustid[ae], common in the United States. The males have stridulating organs at the bases of the front wings. During the summer and autumn, in the evening, the males make a peculiar, loud, shrill sound, resembling the combination Katy-did, whence the name. [1913 Webster]