Sū'per-fe-tā'tion, n.

n. [Fr. superfétation, Sp. superfetacion, It. superfetazione, N. Lat. superfetatio.] A second conception after a prior one, and before the birth of the first, by which two fetuses are growing at once in the same womb; superconception.

It then became a superfetation upon, and not an ingredient in, the national character. Coleridge.