The nature of possible underlying disease states including cancer or infections can often be detected by microscopically visualizing cytological changes in cells which are exfoliated and captured by fluid extraction from body cavity, brushings, washings, or fine needle aspirations.
Cloister definition, a covered walk, especially in a religious institution, having an open arcade or colonnade usually opening onto a courtyard. See more.
cistern-an artificial reservoir for storing liquids; especially an underground tank for storing rainwater. cesspit, cesspool, sump, sink-a covered cistern; waste water and sewage flow into it.pool-an excavation that is (usually) filled with water.oun. 1. cistern-a sac or cavity containing fluid especially lymph or cerebrospinal fluid. cisterna.