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.

---

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.

---

C.I.D. ³ American  

abbreviation

1. Criminal Investigation Department of Scotland Yard.

---

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

---

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

---

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

And it singled out the Jail Café on Sunset Blvd. in Hollywood, where the El Cid restaurant now stands.

From Los Angeles Times • Aug. 8, 2025

Unless the gays convince me to go to Hot Dog, which is a party that’s over at El Cid.

From Los Angeles Times • Nov. 3, 2023

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