pla·​cen·​tal | \ plə-ˈsen-tᵊl How to pronounce placental (audio) \

Definition of placental

 (Entry 1 of 2)

1 : of, relating to, having, or occurring by means of a placenta
2 : eutherian



Definition of placental (Entry 2 of 2)

: a placental mammal : eutherian

Examples of placental in a Sentence

Recent Examples on the Web: Adjective The chemical makeup of placental tissue can’t be replicated synthetically. Andy Peters, ajc, 11 Apr. 2022 The baby, who was subsequently delivered early, had not been getting oxygen due to a placental abruption caused by the crash, the affidavit said. Jacob Beltran, San Antonio Express-News, 18 Mar. 2022 Researchers in 12 countries, including the United States, analyzed placental and autopsy tissue from 64 stillbirths and four newborns who died shortly after birth. Lindsey Tanner, ajc, 10 Feb. 2022 For this study, researchers from 12 countries, including the U.S., looked at placental tissue from 64 stillbirths and four newborns who died shortly after birth. Julie Mazziotta,, 11 Feb. 2022 The 2021 policy does, in fact, stress prenatal detection of rare diseases through methods such as testing placental samples. Johanna Deeksha, Quartz, 21 Jan. 2022 Patients who receive a positive result are supposed to pursue follow-up testing, which often requires a drawing of amniotic fluid or a sample of placental tissue. New York Times, 1 Jan. 2022 The study team also looked at placental tissue collected at the time of birth for some of the participants. Katie Hunt, CNN, 16 Nov. 2021 Hurd and her colleagues worked with 322 parent-child pairs, beginning with profiles of genetic activity in placental samples taken at birth. Emily Willingham, Scientific American, 15 Nov. 2021 Recent Examples on the Web: Noun The maternal transmission via the placental bloodflow to the fetus differs from the maternal transmission of ingested breast milk to the infant. Nina Shapiro, Forbes, 4 Mar. 2021 Origolestes is an ancestor to therian mammals, the group that includes all placentals and marsupials alive today. Jim Daley, Scientific American, 5 Dec. 2019 For example, the specific type of placental cell where Zika can lurk in humans isn't thought to be present in mouse placentas., 10 June 2019 For example, the specific type of placental cell where Zika can lurk in humans isn’t thought to be present in mouse placentas. Washington Post, 9 June 2019 Each increase of 5 micrograms per cubic meter in exposure was associated with 9% shorter cord blood telomeres and 13% shorter placental telomeres, the researchers estimated. Susan Scutti, CNN, 16 Oct. 2017 The researchers reported that the Zika virus binds consistently to a protein in different placental cells called TIM1. Pam Belluck, New York Times, 18 July 2016 There are three kinds of mammals: egg-laying monotremes such as the platypus, marsupials like kangaroos and opossums, and the majority—placental, or eutherian, mammals—including humans and about 4400 other mammal species. Elizabeth Pennisi, Science | AAAS, 19 June 2017 See More

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

First Known Use of placental


1785, in the meaning defined at sense 1


1839, in the meaning defined above

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The first known use of placental was in 1785

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Last Updated

26 Apr 2022

Cite this Entry

“Placental.” Dictionary, Merriam-Webster, Accessed 19 May. 2022.

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More Definitions for placental


pla·​cen·​tal | \ -əl How to pronounce placental (audio) \

Medical Definition of placental

 (Entry 1 of 2)

1 : of, relating to, having, involving, or produced by a placenta placental lactogen placental defects
2 : of or relating to placental mammals



Medical Definition of placental (Entry 2 of 2)


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