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air bladder an air-filled sac in various animals and plants, esp. such a structure located near the spine of certain fish that functions to maintain buoyancy by regulating hydrostatic pressure. (See swim bladder.)
amnion a thin membranous sac, filled with a watery fluid, that contains the embryo of a mammal, bird, or reptile.
ascomycete a fungus of a type that reproduces through spores developed in a sac, such as the yeasts, mildews, and truffles.
bladder an expandable sac or pouch in humans and animals in which gas or liquid, esp. urine, collects. [3 definitions]
blind alley an alley or passageway with one end closed off; cul-de-sac. [1/2 definitions]
bursa a sac in the body, esp. one filled with fluid, that acts to protect against friction, as in a joint.
conceptus all of the parts produced during the period from conception through birth, such as the fetus, the fetal sac, and the umbilical cord.
-cyst sac; cavity; vesicle; bladder.
cyst a fluid-filled vesicle or sac within body tissue, sometimes a pathological development but most often not. [1/3 definitions]
cysticercus the larva of any of several tapeworms, consisting of a headlike part enclosed in a fluid-filled sac; bladderworm.
cysto- bladder; sac.
diverticulitis painful inflammation of a sac that branches off from a hollow organ, esp. the intestine.
diverticulum a tubular pouch or sac that branches out from a body canal, organ, or cavity, occurring as a normal or abnormal growth.
endosperm tissue that is derived from the embryo sac of a plant and that surrounds and nourishes the embryo.
epicardium the inner layer of the thin membranous sac that surrounds the heart. (See pericardium.)
follicle a small cavity or sac with a narrow mouth, such as that surrounding the root of each hair. [1/3 definitions]
gallbladder a small muscular sac that is attached to the liver and that stores bile.
musk a strong-smelling secretion produced in a glandular sac underneath the skin of the male musk deer's abdomen. [1/3 definitions]
pericardium in vertebrates, the membranous sac enclosing the heart.
pleura the thin membranous sac that envelops each lung and lines the thorax in mammals.
Portuguese man-of-war a sea hydrozoan found in warm oceans, having a bladderlike sac that resembles a sail and allows it to float, and trailing many long stinging tentacles that may inflict severe injury.