Find the word definition

The Collaborative International Dictionary
Ampullaceous

Ampullaceous \Am`pul*la"ceous\, a. [L. ampullaceus, fr. ampulla.] Like a bottle or inflated bladder; bottle-shaped; swelling.
--Kirby.

Ampullaceous sac (Zo["o]l.), one of the peculiar cavities in the tissues of sponges, containing the zooidal cells.

Wiktionary
ampullaceous

a. Shaped like a swollen bottle.