Avoid the redundant phrase cut section. (1) The act of cutting. (2) A cut or division. (3) A segment or part of any organ or structure delimited from the remainder. (4) A cut surface. (5) A thin slice of tissue, cells, microorganisms, or any other material for examination under the microscope. SYN: microscopic section. [L. sectio, a cutting, fr. seco, to cut]