Apollonian circle

Noun

 * 1)  Any circle in two families of circles such that every circle in the first family intersects every circle in the second family orthogonally and vice versa.

Translations

 * Czech: Apolloniova kružnice
 * German: Kreis des Apollonios, apollonischer Kreis
 * Greek: απολλώνιος κύκλος
 * Hungarian: Apollóniusz-kör
 * Portuguese: círculo de Apolônio
 * Spanish: círculo de Apolonio