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1580s, from Middle French dissection, from Medieval Latin dissectionem (nominative dissectio), noun of action from past participle stem of Latin dissecare "cut in pieces," from dis- "apart" (see dis-) + secare "to cut" (see section).
dissection dis·sec·tion (dĭ-sěk'shən, dī-)n.
The act or an instance of dissecting.
Something that has been dissected, such as a tissue specimen under study.