SINCE 1828

An Encyclopædia Britannica Company

Medical Dictionary

atovaquone

play

noun ato·va·quone \ə-ˈtō-və-ˌkwōn\

Medical Definition of atovaquone

: an antiprotozoal drug C₂₂H₁₉O₃Cl taken orally especially for the prevention and treatment of Pneumocystis carinii pneumonia and falciparum malaria ◆Atovaquone is used in combination with proguanil in the prevention and treatment of falciparum malaria, a preparation that is marketed under the trademark Malarone.

Seen and Heard

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

show

WORD OF THE DAY

tare

play

the weight of a container

Words at Play

alt-59721dd897313

The 'Best' Way to Sign Off On An E-mail

Give them your best

Words and Phrases That Come from the Dinner Table

Fill your plate with these surprising food words

ghost-being-disinvited-from-party

'Disinvite' or 'Uninvite'?

A disinvited guest is an uninvited problem

alt-596f730ceb5ae

Words We're Watching: 'Scoby'

Kombucha lovers unite.

Ask the Editors

video-title-words-of-the-year-1066

Words of the Year: 1066

Or, Why Pig Meat is Called 'Pork' and Cow Meat is Called 'Beef'

How Often Is 'Biweekly'?

Don't get us started on 'bimonthly'

video-irregardless-grammar-peeve-blend-of-the-synonyms-irrespective-and-regardless

Irregardless

It is in fact a real word (but that doesn't mean you should use it).

video-moose-goose-weird-plurals

Weird Plurals

One goose, two geese. One moose, two... moose. What's up with that?

Word Games

The Emoji Quiz

Think you’re an emoji 👓 expert? Let’s see 🤔

Take the quiz

A Game of Thrones Word Quiz

In the Game of Thrones quiz, you learn some new vocabulary. (It’s quite safe, really. You will not die.)

Take the quiz

Spell It

Can you spell these 10 commonly misspelled words?

Take the quiz

Word Winder's CrossWinder

Word Winder's CrossWinder

A game of winding words.

Play the game