Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary
1

retinal

play
adjective ret·i·nal \ˈre-tə-nəl, ˈret-nəl\

Definition of retinal

  1. :  of, relating to, involving, or being a retina



1838

First Known Use of retinal

1838


2

retinal

play
noun ret·i·nal \ˈre-tə-ˌnal, -ˌnȯl\

Definition of retinal

  1. :  a yellowish to orange aldehyde C20H28O derived from vitamin A that in combination with proteins forms the visual pigments of the retinal rods and cones



Origin and Etymology of retinal

retin- + 3-al


First Known Use: 1944


Medical Dictionary

1

retinal

play
adjective ret·i·nal \ˈret-ən-əl, ˈret-nəl\

Medical Definition of retinal

  1. :  of, relating to, involving, or being a retina <a retinal examination> <retinal rods>




2

retinal

play play
noun ret·i·nal \ˈret-ən-ˌal, -ˌȯl\

Medical Definition of retinal

  1. :  a yellowish to orange aldehyde C20H28O derived from vitamin A that in combination with proteins forms the visual pigments of the retinal rods and cones—called also retinene, retinene1, vitamin A aldehyde





Learn More about retinal

  1. Medical Dictionary: Definition of retinal Britannica.com: Encyclopedia article about retinal


Seen and Heard

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

WORD OF THE DAY

the lowest point

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

fox-in-summer-forest

Which of these is a synonym of inchoate?

massive frightening formless experimental
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ