Green’s Dictionary of Slang

quod n.

[abbr. SE quadrangle; the original was Newgate, but the term became general]

1. [late 17C+] (also quad) prison.

2. [mid-19C] attrib. use of sense 1.

3. [early 19C] a prisoner.

4. [mid-19C–1900s] a police-station.

In compounds

quod cove (n.) [cove n. (1)]

[early 19C] (UK Und.) the governor of a prison; a turnkey.

quod cull (n.) (also quad cull) [cull n.1 (4)]

[mid-18C–mid-19C] a prison warder, a turnkey.