SINCE 1828

An Encyclopædia Britannica Company

Medical Dictionary

homatropine

play

noun hom·at·ro·pine \hō-ˈma-trə-ˌpēn\

Medical Definition of homatropine

: a poisonous crystalline ester of tropine and mandelic acid used in the form of its hydrobromide C₁₆H₂₁NO₃·HBr for dilating the pupil of the eye and in the form of its methyl bromide C₁₆H₂₁NO₃·CH₃Br in combination with hydrocodone in cough supressant preparations—see hycodan

Seen and Heard

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

show

WORD OF THE DAY

crucible

play

a severe test

Words at Play

alt-596f730ceb5ae

Words We're Watching: 'Scoby'

Kombucha lovers unite.

alt-596e1a928254c

Words We're Watching: 'Fidget Spinner'

Don't fight the fad

alt-5956722528373

A Nun's 'Habit' & A Mini-Skirt

They have more in common than you might think.

alt-596cccb141873

Our Verdict on 'Judgy'

Will word nerds judge you for this?

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

Name That Thing

Name That Thing

Test your visual vocabulary with our 10-question challenge!

Take the quiz

SCRABBLE® Sprint

SCRABBLE® Sprint

SCRABBLE® fans, sharpen your skills!

Play the game