from the GNU version of the Collaborative International Dictionary of English
- n. The pouch in which incubation takes place in some Tunicata.
from The Century Dictionary and Cyclopedia
- n. In Ascidia, the pouch in which incubation takes place; a diverticulum of the wall of the atrium, which projects into the atrial cavity, and into which is received the ovarian follicle containing an impregnated ovum.
Sorry, no etymologies found.