from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. One of two siblings produced from the splitting of a single zygote.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. either of two twins developed from the same fertilized ovum (having the same genetic material)
identical ("indistinguishable") + twin ("sibling with whom one has shared the uterus of the mother") (Wiktionary)