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In the United States, the social or political line of demarkation between the white or dominant class and persons of pure or mixed African descent.
(noun)
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Plural In seal-engraving, and in heraldic work in black and white, fine parallel lines engraved upon the field for the conventional expression of heraldic colors.
(noun)
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In psychophysics: The outline of the plane figure (circle, square, triangle) which gives a diagrammatic representation of color sensations and their interrelation.
(noun)
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Any straight line joining two points on or within the solid figure (sphere, double cone, double pyramid) which gives a diagrammatic representation of the totality of visual sensations.
(noun)
The Century Dictionary (Public Domain)