Medical Definition of field
1: an area or division of an activity <a doctor eminent in her field>
2: a complex of forces that serve as causative agents in human behavior
3a: a region of embryonic tissue potentially capable of a particular type of differentiation <a morphogenetic field>b: a region or space in which a given effect (as magnetism) exists
4a: an area that is perceived or under observation; especially : the area visible through the lens of an optical instrument—see visual fieldb: the site of a surgical operation
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