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.
Cloister first entered the English language as a noun in the 13th century; it referred then (as it still does) to a convent or monastery. More than three centuries later, English speakers began using the verb cloister to mean to seclude in or as if in a cloister..