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The act or practice of opening cysts; esp., the operation of cutting into the bladder, as for the extraction of a calculus.

animals; -- so called from the absence of a head or visible organs on the vesicle. These cysts are the immature stages of certain tapeworms. Also applied to similar cysts of different origin.

Pertaining to, or resembling, the acephalocysts.

One of the air cells of algals.

The germinal vesicle.

The gall bladder.

The operation of making an opening in the gall bladder, as for the removal of a gallstone.

An organ of the Ctenophora, supposed to be sensory.

The outside covering of the Bryozoa.

To inclose in a cyst.

Encystment.

Inclosed in a cyst, or a sac, bladder, or vesicle; as, an encysted tumor. The encysted venom, or poison bag, beneath the adder's fang. Coleridge.

s by which many internal parasites, esp. in their larval states, become inclosed within a cyst in the muscles, liver, etc. See Trichina.

The inner layer of the cells of Bryozoa.

Of or pertaining to the liver and gall bladder; as, the hepatocystic ducts.

A cell larger than the others, and of different appearance, occurring in certain algæ related to nostoc.

A cyst in which some unicellular organisms temporarily inclose themselves, from which they emerge unchanged, after a period of drought or deficiency of food. In some instances, a process of spore formation seems to occur within such cysts.

See Encyst.

See Encysted.

A sac containing small, calcareous concretions (otoliths). They are found in many Medusæ, and other invertebrates, and are supposed to be auditory organs.