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Etymology · Ancient Greek

ὅρος

3 English words descend from Ancient Greek ὅρος, most common first.

horopterFor any system of binocular vision, a three-dimensional curve containing all points from which the light will converge into a single image.
horosA stone marking a boundary in Ancient Greece.
horosphereAn n-1-dimensional hyperplane in hyperbolic n-dimensional space: it is (in the Poincaré disk) Euclidean-tangent at infinity to the boundary sphere or (in the upper-half-space model) Euclidean-parallel to the boundary hyperplane.