Webster's Revised Unabridged Dictionary · 1913

Quad

Quad , adjective

[Akin to Anglo-Saxon cwad, cwead, dung, evil, German kot, dung, Old High German quāt.]

Evil; bad; baffling; as, a quade wind. [Obsolete]
Sooth play, quad play, as the Fleming saith. — Chaucer

Also: Quade

Quad , noun

(Printing) A quadrat.

Quad , noun

(Architecture) A quadrangle; hence, a prison. [Cant or Slang]