Cathĕtus

Cathĕtus

Cathĕtus (gr.), senkrechte Linie, s. Katheter; bes. 1) (Phys.), C. incidentĭae, die von einem ausstrahlenden Punkt auf die reflectirende (od. dieselbe als verlängert gedachte) Fläche gezogene Gerade; C. reflexiōnis, eine die Richtung des zurückgeworfenen Lichtstrahls bezeichnende, von der Einfallsstelle bis zu dem durch die Spiegelung erleuchteten Punkte gezogene Gerade; dagegen C. ocŭli, die von dem beschauenden Auge auf die Spiegelfläche od. deren Verlängerung gezogene Gerade; 2) (Bauk.), C. volūtae, die senkrecht durch den Mittelpunkt des Schneckenanges gezogene Linie.


Pierer's Lexicon. 1857–1865.

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