su·​per·​fe·​ta·​tion | \ ˌsü-pər-fē-ˈtā-shən How to pronounce superfetation (audio) \

Definition of superfetation

: a progressive accumulation or accretion reaching an excessive degree

Examples of superfetation in a Sentence

Recent Examples on the Web If superfetation is suspected, a woman's pediatrician can check the maturity of the baby once it's born. Asha C. Gilbert, USA TODAY, 14 Apr. 2021 Her pregnancy was diagnosed as superfetation, a rare condition in which a woman who is already pregnant conceives another baby. Washington Post, 8 Apr. 2021 But fetuses that appear to have different gestational ages aren't necessarily proof of superfetation., 2 Nov. 2017 The rare medical phenomenon is known as superfetation, in which a woman continues to ovulate after becoming pregnant. Char Adams,, 1 Nov. 2017 The difference in their size was obvious in the first trimester of pregnancy and continued, leading the doctor to offer superfetation as a diagnosis. C. Claiborne Ray, New York Times, 27 Feb. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'superfetation.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

See More

First Known Use of superfetation

1603, in the meaning defined above

History and Etymology for superfetation

Medieval Latin superfetation-, superfetatio, from Latin superfetare to conceive while already pregnant, from super- + fetare to bear young, from fetus newly delivered — more at fetus

Keep scrolling for more

Learn More About superfetation

Time Traveler for superfetation

Time Traveler

The first known use of superfetation was in 1603

See more words from the same year

Dictionary Entries Near superfetation




See More Nearby Entries 

Statistics for superfetation

Cite this Entry

“Superfetation.” Dictionary, Merriam-Webster, Accessed 27 Jul. 2021.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

Keep scrolling for more

More Definitions for superfetation


variants: or chiefly British superfoetation \ ˌsü-​pər-​fē-​ˈtā-​shən How to pronounce superfetation (audio) \

Medical Definition of superfetation

: successive fertilization of two or more ova of different ovulations resulting in the presence of embryos of unlike ages in the same uterus


Test Your Vocabulary

Dog Words Quiz

  • shiba puppy more or less demanding cuddles
  • Which of the following animals has a dog in its etymology?
Spell It

Can you spell these 10 commonly misspelled words?

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!