Cad n. : A person who stands at the door of an omnibus to open and shut it, and to receive fares; an idle hanger-on about innyards.

Cad n. : A lowbred, presuming person; a mean, vulgar fellow.

Example:
How does auto Cad and fl studio work on windows running on a mac?

Taxonomy
CAD, Computer-aided design, design, model, CAD systems, 3D, tools, engineers, geometry, drawing, parametric, history, 3D solids, free encyclopedia, 3D models, curves, software, assemblies.

Defination from the web:
CAD is an important industrial art extensively used in many applications, including automotive, shipbuilding, and aerospace industries, ... Because of its enormous economic importance, CAD has been a major driving force for research in computational geometry, computer graphics (both ...