1. n. an organism that is genetically identical to another, whether because both organisms originate from a single common parent as a result of asexual reproduction or because one is derived from genetic material taken from the other, as in reproductive cloning. Differences in characters between cloned individuals are assumed to be the result of environmental factors.

2. n. a group of genetically identical organisms.

3. n. a group of cells derived from a single parent cell.

4. vb. to produce genetically identical copies of a particular organism or cell. —clonal adj.