Medical Definition of dissection
1: the act or process of dissecting or separating: asa: the surgical removal along natural lines of cleavage of tissues which are or might become diseasedb: the digital separation of tissues (as in heart-valve operations)—compare finger fracturec: a pathological splitting or separation of tissue—see aortic dissection
2a: something (as a part or the whole of an animal) that has been dissectedb: an anatomical specimen prepared in this way
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