Ci

abbreviation (1)

Definition of Ci

 (Entry 1 of 2)

1 cirrus
2 curie

CI

abbreviation (2)

Definition of CI (Entry 2 of 2)

1 cast iron
2 certificate of insurance
3 Channel Islands
4 confidential informant; criminal informant

Keep scrolling for more

More Definitions for Ci

Medical Definition of CI

chemotherapeutic index

Legal Definition of CI

certificate of insurance; cost and insurance

More from Merriam-Webster on Ci

Spanish Central: Translation of Ci

Comments on Ci

What made you want to look up Ci? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

transposition of initial sounds of words

Get Word of the Day daily email!

Test Your Vocabulary

Word Puzzles

  • alt 57589b2b4c6a3
  • Which answer pairs best with each of the following words? living, estate, club, music, road, mile
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Syn City

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!