: passing through or occurring by way of the placenta
transplacental immunization

Word History

Etymology

International Scientific Vocabulary

First Known Use

1902, in the meaning defined above

Time Traveler
The first known use of transplacental was in 1902

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Cite this Entry

“Transplacental.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/transplacental. Accessed 7 Jul. 2026.

Medical Definition

transplacental

adjective
: relating to, involving, or being passage (as of an antibody) between mother and fetus through the placenta
transplacental immunization
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