test-tube baby

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A baby developed from an egg that was fertilized outside the body and then implanted in the uterus of the biological or surrogate mother.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a baby conceived by fertilization that occurs outside the mother's body; the woman's ova are removed and mixed with sperm in a culture medium - if fertilization occurs the blastocyte is implanted in the woman's uterus