Gain access to thousands of additional definitions and advanced search features—ad free! JOIN NOW
: a substance (such as recombinant erythropoietin) that increases the oxygen-carrying capacity of blood so as to temporarily improve athletic performance — see blood doping
Share blood booster
Resources for blood booster
Comments on blood booster
What made you want to look up blood booster? Please tell us where you read or heard it (including the quote, if possible).
to reject or criticize sharply
Get Word of the Day daily email!
Words from Greek and Roman Mythology Quiz
Test your knowledge - and maybe learn something along the way.
Test Your Knowledge - and learn some interesting things along the way.
Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!
Words from the week of 10/19/2018
The same, but different
At last we meet.
Getting a hold on two similar words.
And is one way more correct than the others?
The story of an imaginary word that managed to sneak past our editors and enter the dictionary.
How to use a word that (literally) drives some people nuts.
The awkward case of 'his or her'
A mythological/etymological mashup!
Words to improve your Scrabble game
SCRABBLE® fans, sharpen your skills!