Noah Webster's Dictionary (n.) A large, green, arboreal, orthopterous insect (Cyrtophyllus concavus) of the family Locustidae, 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.

Multi-Version Concordance Katydid (1 Occurrence) Leviticus 11:22 Even of these you may eat: any kind of locust, any kind of katydid, any kind of cricket, and any kind of grasshopper. (WEB NIV)