: a median line
especially
: the median line or median plane of the body or some part of the body
Examples of midline in a Sentence
Recent Examples on the Web
China has also ramped up military pressure on the island, including near-daily flights across the midline of the Taiwan Strait and large-scale exercises simulating a blockade.
—
Micah McCartney, MSNBC Newsweek, 5 Nov. 2025
The team identified a continuous midline feature that began as a fleshy crest along the neck and trunk and transitioned over the hips into a single row of spikes running down the tail — each spike positioned over a single vertebra and fitted to each other.
—Abhishek Bhardwaj, Interesting Engineering, 24 Oct. 2025
The fossils showed Edmontosaurus boasted a continuous midline feature on its body, with a fleshy crest along the neck and trunk that changes over the hips into a single row of spikes running down the tail.
—Reuters, NBC news, 24 Oct. 2025
Paleontologists were able to identify a continuous midline anatomical detail on E. annectens that started as a crest along its neck and trunk, before transforming into a single row of spikes over its hips and down its tail.
—Andrew Paul, Popular Science, 23 Oct. 2025
See All Example Sentences for midline
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Micah McCartney, MSNBC Newsweek, 5 Nov. 2025
The team identified a continuous midline feature that began as a fleshy crest along the neck and trunk and transitioned over the hips into a single row of spikes running down the tail — each spike positioned over a single vertebra and fitted to each other.
—Abhishek Bhardwaj, Interesting Engineering, 24 Oct. 2025
The fossils showed Edmontosaurus boasted a continuous midline feature on its body, with a fleshy crest along the neck and trunk that changes over the hips into a single row of spikes running down the tail.
—Reuters, NBC news, 24 Oct. 2025
Paleontologists were able to identify a continuous midline anatomical detail on E. annectens that started as a crest along its neck and trunk, before transforming into a single row of spikes over its hips and down its tail.
—Andrew Paul, Popular Science, 23 Oct. 2025
See All Example Sentences for midline
Cite this Entry
“Midline.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/midline. Accessed 7 Dec. 2025.
Copy CitationKids Definition
midline
noun
mid·line
ˈmid-ˌlīn 
: a line through the middle of something
especially
: a line through a body or one of its parts that lies in a plane dividing it into halves that are mirror images of each other
Medical Definition
midline
noun
mid·line
ˈmid-ˌlīn, ˌmid-ˈlīn
: a median line
especially
: the median line or median plane of the body or some part of the body
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