To cut in pieces; divide into parts with or as with a cutting instrument: as, to dissect a fowl. Specifically2. To cut in pieces, or separate the distinct or elementary parts of, as an animal or a plant, for the purpose of studying its organization or the functions and morbid affections of its organs and tissues; anatomize.To examine part by part or point by point; treat or consider piecemeal; analyze, as for the purpose of criticism; describe in detail: as, to dissect a man's character.In geology, to cut up or erode (a plateau, mountain, etc.) into numerous irregular valleys or ravines: as, a dissected plateau; a dissected mountain-range.