Did you know?

Click any word in a definition or example to find the entry for that word

molecular weight

 - definition
Close

What are red words?

90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent.

Close

Thesaurus

The thesaurus of synonyms and related words is fully integrated into the dictionary entries. Click on the T button in an entry to review the synonyms and related words for that meaning.

more
noun [countable/uncountable] science British English pronunciation: molecular weight 
Word Forms
Close
singularmolecular weight
pluralmolecular weights

yummy

young urban male: a professional man under 30 who is interested in fashionable appearance …

BuzzWord Article

Word of the Day

blackjack

a card game in which players try to collect cards that add up to no more than 21. Blackjack is...

Open Dictionary

total football

a style of play in football in which any player except the goalkeeper can take the position of any other player

add a word

Blog

A must for anyone with an interest in the changing face of language. The Macmillan Dictionary blog explores English as it is spoken around the world today.

global English and language change from our blog