Adjective:

నీగ్రోయిడ్,

nephroid's Usage Examples:

and 2r diameter of small circle Epicycloid examples k 1          a cardioid k 2          a nephroid k 3 - resembles a trefoil k 4 - resembles.

Hence, a nephroid is an epicycloid.

parabola, ellipse, nephroid).

at the bottom of a cylindrical cup is half of a nephroid, which looks quite similar.

In geometry, a nephroid (from the Greek ὁ νεφρός ho nephros) is a specific plane curve whose name means "kidney-shaped" (compare nephrology).

circle Epicycloid examples k 1          a cardioid k 2          a nephroid k 3 - resembles a trefoil k 4 - resembles a quatrefoil k 2.

(including perfectly parallel rays, as if from a point source at infinity), a nephroid-shaped patch of light can be produced.