vocal sac

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Related to vocal sacs: Vocal Pouch

vocal sac

n.
An inflatable pouch on the floor of the mouth cavity of a male frog that amplifies sounds produced by the vocal cords.
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References in periodicals archive ?
Sex was determined by the everted lateral black vocal sacs and conspicuous corneous nuptial pads on the first finger.
That big bubble under the tree frog's throat is his vocal sac. When the sac fills with air, the sound of the frog's call bounces around inside and grows louder.
Purgue uncovered the ear phenomenon while investigating a long-standing puzzle about vocal sacs in frogs and toads.
Lutz, 1973) and a pair of external vocal sacs (Cochran, 1954).