1

Sr

abbreviation

Definition of Sr

1 senior
2 senor; señor
3 sister

2

Sr

symbol

Definition of Sr

strontium

SR

abbreviation

Definition of SR

1 seaman recruit
2 shipping receipt

SR Defined for Kids

Sr.

abbreviation

Definition of Sr. for Students

1 senior
2 sister

Medical Dictionary

Sr

symbol

medical Definition of Sr

strontium

SR

abbreviation

medical Definition of SR


S-R

abbreviation

medical Definition of S-R

stimulus-response

Learn More about sr


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

to curse or denounce

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Citation

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!