horosphere
An -dimensional hyperplane in hyperbolic -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.

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• horoball — noun A horosphere together with the space above it …   Wiktionary

• horospherical — adjective Of or pertaining to a horosphere …   Wiktionary

• Horobola — Este artículo o sección necesita referencias que aparezcan en una publicación acreditada, como revistas especializadas, monografías, prensa diaria o páginas de Internet fidedignas. Puedes añadirlas así o avisar al autor prin …   Wikipedia Español

• horo- — ♦ Élément, du gr. hôro , de hôra « heure ». I. ⇒HORO 1, élém. formant Élém. tiré du gr. , de « heure », entrant dans la formation de qq. subst. et adj., dans différents domaines : horodateur, horo dateur, trice, subst. masc. et adj. « (Appareil)… …   Encyclopédie Universelle