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From The Collaborative International Dictionary of English v.0.48:
Cicada \Ci*ca"da\ (s[i^]*k[=a]"d[.a]), n.; pl. E. Cicadas (-d[.a]z), L. Cicad[ae] (-d[=e]). [L.] (Zool.) Any species of the genus Cicada or of the family Cicadidae. They are large hemipterous insects, with nearly transparent wings. The male makes a shrill sound by peculiar organs in the under side of the abdomen, consisting of a pair of stretched membranes, acted upon by powerful muscles. A noted American species (Cicada septendecim) is called the seventeen year locust. Another common species is the dogday cicada. Syn: cicala. [1913 Webster]