| has gloss | (noun) a structure resembling a bag in an animal
sac |
| lexicalization | eng: sac |
| subclass of | (noun) (anatomy) a natural hollow or sinus within the body
bodily cavity, cavum, cavity |
| has subclass | (noun) membranous structure enclosing the yolk of eggs in birds, reptiles, marsupials, and some fishes; circulates nutrients to the developing embryo
yolk sac |
| has subclass | (noun) membranous structure that functions as the circulatory system in mammalian embryos until the heart becomes functional
vesicula umbilicus, umbilical vesicle, vitelline sac, yolk sac |
| has subclass | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals)
amnion, amnios, amniotic sac |
| has subclass | (noun) the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
chorion |
| has subclass | (noun) the saclike body cavity of a coelenterate
coelenteron |
| has subclass | (noun) an air-filled sac near the spinal column in many fishes that helps maintain buoyancy
float, air bladder, swim bladder |
| has subclass | (noun) any of the membranous air-filled extensions of the lungs of birds
air sac |
| has subclass | (noun) any of the thin-walled extensions of the tracheae of insects
air sac |
| has subclass | (noun) a small sac or pouch (especially the smaller chamber of the membranous labyrinth)
sacculus, saccule |
| has subclass | (noun) a distensible membranous sac (usually containing liquid or gas)
bladder, vesica |
| has subclass | (noun) one of the small sacs or saclike dilations in a compound gland
acinus |
| has subclass | (noun) a small fluid-filled sac located between movable parts of the body especially at joints
bursa |
| has subclass | (noun) a sac or cavity containing fluid especially lymph or cerebrospinal fluid
cisterna, cistern |
| has subclass | (noun) (anatomy) saclike structure in any of various animals (as a marsupial or gopher or pelican)
pouch, pocket |
| has subclass | (noun) a small anatomically normal sac or bladderlike structure (especially one containing fluid)
vesicle, cyst |
| has subclass | (noun) a tiny sac for holding air in the lungs; formed by the terminal dilation of tiny air passageways
air sac, air cell, alveolus |
| has subclass | (noun) the membrane surrounding the heart
pericardial sac |