Ampullaceous
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Am`pul`la´ceous
a. 1. Like a bottle or inflated bladder; bottle-shaped; swelling.
Ampullaceous sac
(Zool.) one of the peculiar cavities in the tissues of sponges, containing the zooidal cells.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.