segmentation

noun

1. division into segments.
2. Biology.
   1. the subdivision of an organism or of an organ into more or less equivalent parts.
   2. cell division.

noun

1. the act or an instance of dividing into segments
2. embryol another name for cleavage (def. 4)
3. zoology another name for metamerism (def. 1)

n.1650s, “a cutting in small pieces;” 1851 of cells, from segment (v.) + -ation. n.

1. cleavage