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.
Definition of gutter for English Language Learners : a long, hollow device that is attached to the edges of a roof to catch rain and carry it away from a building : a low area at the side of a road that is used to catch water and carry it away from the road