A syllable in which sound is priduced by both to- and fro- movements of the stridulatory apparatus.
"A syllable in which sound is produced by opening and closing wing-strokes in the Ensifera, and both upward and downward leg-strokes in the gomphocerine grasshoppers." 
- . The Songs of the Grasshoppers and Crickets of Western Europe. Colchester, Essex: Harley Books; 1998.
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