linea nigra

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 [lin´e-ah] (L.)
linea al´ba white line; the tendinous median line on the anterior abdominal wall between the two rectus muscles.
li´neae albican´tes white or colorless lines on the abdomen, breasts, or thighs caused by mechanical stretching of the skin, with weakening of the elastic tissue; see also atrophic striae.
linea as´pera a rough longitudinal line on the back of the femur for muscle attachments.
linea ni´gra the linea alba when it has become pigmented in pregnancy.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

lin·e·a ni'g·ra

the linea alba in pregnancy, which then becomes pigmented.
Synonym(s): black line
Farlex Partner Medical Dictionary © Farlex 2012

lin·e·a nig·ra

(lin'ē-ă nī'gră)
The linea alba in pregnancy, which then becomes pigmented.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in classic literature ?
If we choose to surround objects with a black line, the world will see the black line, and there will be a black line; and if we paint grass red and cows blue, it'll see them red and blue, and, by Heaven, they will be red and blue."
It passed behind the black line of the parapet, in the last long rays of the western light.
I could barely see the dim black line of the hedges on either side, and any chance obstacle in the road would have thrown me down to a certainty.
The delightful Charley walked in, with his eyes fixed on the back of her governess whose raised veil hid her forehead like a brown band above the black line of the eyebrows.
The marshes were just a long black horizontal line then, as I stopped to look after him; and the river was just another horizontal line, not nearly so broad nor yet so black; and the sky was just a row of long angry red lines and dense black lines intermixed.
They stood in long black lines, waiting before the pit entrances of the theatres-- short-coated boys, and girls in sailor hats, all shivering and chatting gayly.
An enormous settee, or sofa, covered with light chintz, stretched along the walls for nearly twenty feet on one side of the hail; and chairs of wood, painted a light yellow, with black lines that were drawn by no very steady hand, were ranged opposite, and in the intervals between the other pieces of furniture.
Far away between the black lines of trunks the quick glitter of steel marked where the Company pursued its way.
He pointed out to me that there were certain black lines which formed crossbars upon the series of brilliant colours extending from the red at one end through gradations of orange, yellow, green, blue, and indigo to the violet at the other.
The lady of the house appeared to be a woman of about fifty years of age, thin-faced, and with black lines under the eves.
Showing a map by the National Oceanic and Atmospheric Administration (NOAA) that had a black line encircling a portion of Alabama, ( Trump asserted: "This was the original forecast."
The Sanarate (black line on chart) posting, run by the Central Bank of Iran, put the dollar at 127,501 on July 6 and 118,550 on July 18.