ad perpendiculum directus plumb straight, de duabus lineis, concerning two linesquarum capita anguli formam efficiunt, whose ends form an angle 2.76.4,
[vulgo commonly ἐγκαρσίως], 6.99.3,
similiter similarly 7.4.1
et and 7.7.1. [ἐγκαρσίως,vid see ἐγκάρσιος.]