superfetation

Etymology
From, from.

Noun

 * 1) The formation of a fetus while another fetus is already present in the uterus.
 * 2) An excessive accumulation; a superfluous addition.
 * 3) * 1992, Geoffrey Wall, translator of, 
 * These gentlemen were greatly astonished at Bovary's romantic ideas, and the pharmacist hurried in to say to him: "This velvet looks to me rather a superfetation. Besides, the expense..."

Related terms

 * superfetatious
 * superfetatious

Translations

 * French:
 * Ido: