Cid

¹ American  

[sid, theed] / sɪd, θid /

noun

1. The, El Cid CampeadorRodrigo Díaz de Bivar, c1040–99, Spanish soldier: hero of the wars against the Moors.

2. (italics) Le. Le Cid.

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c.i.d. ² American  

Or cid,

abbreviation

Automotive.

1. cubic-inch displacement: the displacement of an engine measured in cubic inches.

   My old car had a 302 c.i.d. engine.

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C.I.D. ³ American  

abbreviation

1. Criminal Investigation Department of Scotland Yard.

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CID ¹ British  

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

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Cid ² British  

/ sɪd, θið /

noun

1. El or the. original name Rodrigo Diaz de Vivar. ?1043–99, Spanish soldier and hero of the wars against the Moors

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Etymology

Origin of C.I.D.

First recorded in 1900–05

Example Sentences

“Traveling offseason is one of the easiest ways seniors can stretch their travel budget,” advises Melissa Cid, a consumer savings expert at MySavings.com.

From MarketWatch • Feb. 18, 2026

Joel Kim Booster’s ideal Sunday Funday involves breakfast burritos, Ginger Rogers Beach, Chinese food, El Cid and an afterparty at his place.

From Los Angeles Times • Jan. 15, 2026

He is married to Lissette del Cid, with whom he has three daughters and three grandchildren.

From Barron's • Dec. 24, 2025

Fresno City College student Domaris Cid is among the younger residents who see the chance to expand their educational options while still living at home.

From Los Angeles Times • Feb. 8, 2024

The only sound was Rasseem’s low chuckle, which hissed through the cavities of his teeth and sounded to my ears like a snake whispering the dreaded name of Cid.

From "The Many Assassinations of Samir, the Seller of Dreams" by Daniel Nayeri