sect = cut; separate

bisect (v) to cut into two pieces

dissect (v) to cut apart for the purpose of investigation

insect (n) a class of small arthropod animals that has three separate sections to their bodies: head, thorax,abdomen

intersection (n) the point at which two lines or roads meet and cut across each other

section (n) a separate part of something

sectional (n) a couch that is made up of separate pieces

sector (n) a separate part of a society, group, or area

transect (v) to cut across something

trisect (v) to cut into three separate pieces

vivisection (n) surgery on living animals; medical research that involves cutting into living animals to study organs, tissues, or diseases