scion

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sci·on

(sī'ŏn),
In experimental embryology, an embryonic tissue or part grafted to another embryo of the same or of another species.
See also: chimera.
[O. Fr. sion, shoot, sprig, fr. L. seco, to cut]

scion

the part of a plant, usually a piece of young stem, that is inserted into a rooted STOCK (1) to produce a GRAFT.