01 n. A pouch or sac without opening, usually membranous and containing morbid matter, which is accidentally developed in one of the natural cavi…
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1.
A pouch or sac without opening, usually membranous and containing morbid matter, which is accidentally developed in one of the natural cavities or in the substance of an organ.(Med.)
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2.
One of the bladders or air vessels of certain algæ, as of the great kelp of the Pacific, and common rockweeds (Fuci) of our shores.(Bot.)
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3.
A small capsule or sac of the kind in which many immature entozoans exist in the tissues of living animals; also, a similar form in Rotifera, etc.(Zool.)