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cyst

cyst

 
pronunciation:
sIst
part of speech: noun
definition 1: a fluid-filled vesicle or sac within body tissue, usu. an abnormal or pathological development.
Fortunately, the lump she'd detected turned out to be a benign cyst and not a tumor.
definition 2: in certain lower plants and fungi, a chamber containing reproductive cells.
definition 3: the resistant wall encapsulating the dormant form of many microscopic organisms, or a dormant organism possessing such a resistant wall.