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Definition of: sialid
(sī′ə·lid) noun
Any member of a family of insects (Sialidae, order Megaloptera), with enlarged or elongated thorax, including the hellgrammite and related genera.
—adjective Of or pertaining to the Sialidae. Also si·al·i·dan (sī·al′ə·dən). [<Gk. sialis, kind of bird]
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