midline

[ mid-lahyn ]

/ ˈmɪdˌlaɪn /

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Zoology. the median plane of the body of an animal.

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The rainy weather could not ________ my elated spirits on my graduation day.

First recorded in 1865–70; mid- + line¹

Immediately behind the hump is a series of knuckles or crenulations along the midline.
Whales, Dolphins, and Porpoises of the Western North Atlantic|Stephen Leatherwood
The single blowhole is located well to the left of the midline and far forward on the head.
Whales, Dolphins, and Porpoises of the Western North Atlantic|Stephen Leatherwood
Third vertebral scute: Length of anterior margin, 33; greatest width, 42; length at midline, 40 (estimated).
A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma|Edwin C. Galbreath
The pectoro-abdominal suture is anteriorly convex at the sides and concave at the midline.
A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma|Edwin C. Galbreath

Nuchal: Width of anterior margin, 12 (estimated); greatest width, 37 (estimated); length at midline, 35 (estimated).
A New Extinct Emydid Turtle from the Lower Pliocene of Oklahoma|Edwin C. Galbreath

midline

[ mĭd′līn′ ]

A medial line, especially the medial line or plane of the body.