placental

1 of 2

adjective

pla·​cen·​tal plə-ˈsen-tᵊl How to pronounce placental (audio)
1
: of, relating to, having, or occurring by means of a placenta
2

placental

2 of 2

noun

: a placental mammal : eutherian

Examples of placental in a Sentence

Recent Examples on the Web
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Adjective
The show’s name referred to their self-identification as helpless babies overwhelmed by the pressures of modernity, comforted only by coating themselves in fancy serums and moisturizers to recreate the peaceful, placental insulation of the womb. Literary Hub, 9 Apr. 2026 The young remain firmly attached to the milk-giving teats for a period corresponding roughly to the latter part of development of the fetus in the womb of a placental mammal (eutherian). Encyclopedia Britannica, 2 Apr. 2026
Noun
The true placenta of the placentals allows for a longer developmental period within the protection of the womb, a factor considered to have contributed to the evolutionary success of the group. Encyclopedia Britannica, 2 Apr. 2026 In contrast, in a tree focused on marsupials, one or two placental mammals could be included at the bottom of the page for comparison. Kevin Omland, The Conversation, 9 Feb. 2026 See All Example Sentences for placental

Word History

First Known Use

Adjective

1785, in the meaning defined at sense 1

Noun

1839, in the meaning defined above

Time Traveler
The first known use of placental was in 1785

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Cite this Entry

“Placental.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/placental. Accessed 16 Apr. 2026.

Medical Definition

placental

1 of 2 adjective
pla·​cen·​tal -əl How to pronounce placental (audio)
1
: of, relating to, having, involving, or produced by a placenta
placental lactogen
placental defects
2
: of or relating to placental mammals

placental

2 of 2 noun
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