pneumatocyst

Etymology

From pneumato- + cyst.

pneumatocyst means A sac or other structure containing air and used for flotation by a marine organism, chiefly used in reference to those of kelps and siphonophores. Lexicurio rates it Sui generis — a strength score of 87 out of 100.

noun

A sac or other structure containing air and used for flotation by a marine organism, chiefly used in reference to those of kelps and siphonophores.