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

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

From Barron's • Dec. 24, 2025

But knowing that thousands of fans will be looking to keep the party going after the Rose Bowl show, who knows if the next Chappell Roan will be striding through El Cid on Friday.

From Los Angeles Times • Oct. 9, 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

I know you must be thinking that everyone knows the name of Cid.

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