Cid

Look up CID, Cid, or cid in Wiktionary, the free dictionary.

Cid may refer to:

Cid (soil)
Cubic inch (c.i.d., cid), a displacement unit for internal combustion engines
Cid, a slang term for lysergic acid diethylamide (LSD)
Content-ID, a URI scheme (cid:) that allows the use of MIME within email