molecular mass

noun

Definition of molecular mass

: the mass of a molecule that is equal to the sum of the masses of all the atoms contained in the molecule

First Known Use of molecular mass

1873

in the meaning defined above

See Words from the same year
NEW! Time Traveler

Seen and Heard

What made you want to look up molecular mass? 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 treat with excessive attention

Get Word of the Day daily email!

Test Your Vocabulary

April 2018 Words of the Day Quiz

  • rain-on-rainbow-umbrella
  • Which is the best synonym of traduce?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Add Diction

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!