Did you know?

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

blastocyst - definition and synonyms

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.

noun biology
  1. From our crowdsourced Open Dictionary
    an embryo that has developed for five to seven days after fertilization and has two distinct cell types and a central cavity filled with fluid

    Many clinics are now offering blastocyst transfer as a means of improving chances of pregnancy after single embryo transfer.

    Submitted from United Kingdom on 04/04/2017

deep learning

a form of machine learning which incorporates the use of neural networks

BuzzWord Article

Word of the Day


meat from a young cow

Open Dictionary

snap election

a general election … that is called earlier than expected

add a word


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
Macmillan learn live love play