Definition of IL 

(Entry 1 of 2)

1 Illinois

2 interleukin often used with an identifying number IL-6

il-

prefix

Definition of il- (Entry 2 of 2)

— see in-

Learn More about IL

Dictionary Entries near IL

I know what you mean

ikon

il-

IL

Il'men'

ILA

ilama

Statistics for IL

Look-up Popularity

Keep scrolling for more

More Definitions for IL

Kids Definition of IL

Illinois

il-

Kids Definition of il-

see in-

Medical Definition of IL 

interleukin often used with an identifying number IL-2 IL-6

More from Merriam-Webster on IL

Nglish: Translation of IL for Spanish Speakers

Britannica English: Translation of IL for Arabic Speakers

Comments on IL

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

WORD OF THE DAY

by word of mouth

Get Word of the Day daily email!

Test Your Vocabulary

Name that Food Quiz

Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

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!