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American Dictionary of the English Language

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Conoid


CONOID, noun [Gr., a cone, form.]

1. In geometry, a solid formed by the revolution of a conic section about its axis. If the conic section is a parabola, the resulting solid is a parabolic conoid or paraboloid; if a hyperbola, the solid is a hyperbolic conoid or hyperboloid; of an ellipse, an elliptic conoid a spheroid, or an ellipsoid.

2. In anatomy, a gland in the third ventricle of the brain, resembling a cone or pine-apple, and called the pineal gland.