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n.1.(Zool.) The outside covering of the Bryozoa.
References in periodicals archive ?
A computed tomography scan of the chest was performed, which confirmed a ruptured hydatid cyst with the ectocyst lying collapsed within the pericyst.
The outer layer is the pericyst, which consists of compressed liver; inside this is the endocyst, a germinal layer; and inside this is the ectocyst, a thin membrane.