Criminal Investigation Department of Scotland Yard.
c.i.d.
Automotive.
1.
cubic-inch displacement: the displacement of an engine measured in cubic inches:
My old car had a 302 c.i.d. engine.
Also, cid, CID.
Le Cid
[French luhseed] /French lə ˈsid/
noun
1.
a drama (1636) by Corneille.
British Dictionary definitions for Cid
Cid
/sɪd; Spanish θið/
noun
1.
Elorthe. original name Rodrigo Diaz de Vivar. ?1043–99, Spanish soldier and hero of the wars against the Moors
CID
abbreviation
1.
(in Britain) Criminal Investigation Department; the detective division of a police force
2.
cruel, inhumane, and degrading: denoting the brutal and demeaning treatment of prisoners
Word Origin and History for Cid
1680s, from Spanish cid "chief, commander," from Arabic sayyid "lord." A title given in Spanish literature to Castilian nobleman and warlord Ruy Diaz, Count of Bivar (c.1040-1099).