helix in Bulgarian
helix in Bulgarian
спира́ла
(mathematics) A curve on the surface of a cylinder or cone such that its angle to a plane perpendicular to the axis is constant; the three-dimensional curve seen in a screw or a spiral staircase.
охлюв
(anatomy) The incurved rim of the external ear.
спира́ла
(anatomy) The incurved rim of the external ear.