Cyst vs. Exospore

Cystnoun

A pouch or sac without opening, usually membranous and containing morbid matter, which develops in one of the natural cavities or in the substance of an organ.

Cystnoun

(medicine) Of or pertaining to the urinary bladder or gall bladder (in compounds).

Cystnoun

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.

Cystnoun

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.

Cystnoun

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.

Cystnoun

a closed sac that develops abnormally in some body structure

Cystnoun

a small anatomically normal sac or bladderlike structure (especially one containing fluid)

Cyst

A cyst is a closed sac, having a distinct envelope and division compared with the nearby tissue. Hence, it is a cluster of cells that have grouped together to form a sac (like the manner in which water molecules group together to form a bubble); however, the distinguishing aspect of a cyst is that the cells forming the of such a sac are distinctly abnormal (in both appearance and behaviour) when compared with all surrounding cells for that given location.

Exosporenoun

The outer layer of a spore, especially in some algae and fungi.

Exosporenoun

The extreme outer wall of a spore; the epispore.