mydriatic

1 of 2

adjective

myd·ri·at·ic ˌmid-rē-ˈat-ik

: causing or involving dilation of the pupil of the eye

mydriatic

2 of 2

noun

: a drug that produces dilation of the pupil of the eye

Browse Nearby Words

mydriasis

mydriatic

myectomy

See all Nearby Words

Cite this Entry

Style

“Mydriatic.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/mydriatic. Accessed 30 Jul. 2025.

Copy Citation

More from Merriam-Webster

Play Quordle: Guess all four words in a limited number of tries. Each of your guesses must be a real 5-letter word.

Can you solve 4 words at once?

Can you solve 4 words at once?

Word of the Day

doppelgänger

Listen to the pronunciation of doppelgänger

See Definitions and Examples »

Get Word of the Day daily email!

Popular in Grammar & Usage

How to Use Em Dashes (—), En Dashes (–) , and Hyphens (-)

'Affect' vs. 'Effect'

Using Bullet Points ( • )

The Difference Between 'i.e.' and 'e.g.'

Democracy or Republic: What's the difference?

Popular in Wordplay

Our Best Historical Slang Terms

Even More Bird Names that Sound Like Insults (and Sometimes Are)

12 Lovely and Unusual Words for the Natural World

Better Ways to Say 'This Sucks'

8 Words with Fascinating Histories

Popular

How to Use Em Dashes (—), En Dashes (–) , and Hyphens (-)

Our Best Historical Slang Terms

Even More Bird Names that Sound Like Insults (and Sometimes Are)