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clone (n.)

1903, in botany, "group of cultivated plants each of which is a transplanted part of one original," from Latinized form of Greek klōn "a twig, spray," related to klados "sprout, young branch, offshoot of a plant," possibly from PIE root *kel- (1) "to strike, cut" (see holt). Meaning "person or animal replicated from a single cell of another and genetically identical to it" is by 1970 (theoretical), Figurative use, "one who slavishly imitates another," is by 1978.

clone (v.)

1959, from clone (n.). Extension to genetic duplication of animals and human beings is from 1970. Related: Cloned; cloning.

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Definitions of clone from WordNet
1
clone (n.)
a person who is almost identical to another;
Synonyms: ringer / dead ringer
clone (n.)
an unauthorized copy or imitation;
Synonyms: knockoff
clone (n.)
a group of genetically identical cells or organisms derived from a single cell or individual by some kind of asexual reproduction;
Synonyms: clon
2
clone (v.)
make multiple identical copies of;
people can clone a sheep nowadays
From wordnet.princeton.edu