: an unborn or unhatched vertebrate especially after attaining the basic structural plan of its kind
specifically
: a developing human from usually two months after conception to birth compare embryo sense 1a
Examples of fetus in a Sentence
Recent Examples on the Web
Instead the gestational environment starts shaping fetuses’ brain processing even before birth.
—
Meghie Rodrigues, Scientific American, 7 Oct. 2025
Those recalls were the major change in Friday’s FDA update on the outbreak, credited with sickening 20 people and killing four, one of which was a fetus, over 15 states.
—David J. Neal, Miami Herald, 5 Oct. 2025
Her 103-degree fever and dangerously low blood pressure threatened her and her fetus’s life.
—Tami S. Rowen, The Conversation, 3 Oct. 2025
An expecting mother’s blood volume rises by 45% and even up to 50-60% percent in the late third trimester to feed the growing fetus.
—Elizabeth Yuko, Flow Space, 30 Sep. 2025
See All Example Sentences for fetus
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Meghie Rodrigues, Scientific American, 7 Oct. 2025
Those recalls were the major change in Friday’s FDA update on the outbreak, credited with sickening 20 people and killing four, one of which was a fetus, over 15 states.
—David J. Neal, Miami Herald, 5 Oct. 2025
Her 103-degree fever and dangerously low blood pressure threatened her and her fetus’s life.
—Tami S. Rowen, The Conversation, 3 Oct. 2025
An expecting mother’s blood volume rises by 45% and even up to 50-60% percent in the late third trimester to feed the growing fetus.
—Elizabeth Yuko, Flow Space, 30 Sep. 2025
See All Example Sentences for fetus
Cite this Entry
“Fetus.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fetus. Accessed 13 Oct. 2025.
Copy CitationKids Definition
fetus
noun
fe·tus
ˈfēt-əs 
plural fetuses
: a young animal while in the body of its mother or in the egg especially in the later stages of development
especially
: a developing human being in the uterus from usually two months after pregnancy occurs to birth compare embryo sense 1
Medical Definition
fetus
noun
fe·tus
variants
or chiefly British foetus
plural fetuses or chiefly British foetuses or foeti
ˈfēt-ˌī
: an unborn or unhatched vertebrate especially after attaining the basic structural plan of its kind
specifically
: a developing human from usually two months after conception to birth compare embryo
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