follow Dictionary.com

Winning Words of the Scripps Spelling Bee

retinal1

[ret-n-uh l] /ˈrɛt n əl/
adjective
1.
of or relating to the retina of the eye.
Origin of retinal1
1830-1840
1830-40; retin(a) + -al1

retinal2

[ret-n-al, -awl] /ˈrɛt nˌæl, -ˌɔl/
noun, Biochemistry
1.
an orange pigment, C 2 0 H 2 8 O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde.
Also, retinene
[ret-n-een] /ˈrɛt nˌin/ (Show IPA)
.
Origin
1940-45; retin(a) + -al3
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
Cite This Source
Examples from the web for retinal
British Dictionary definitions for retinal

retinene

/ˈrɛtɪˌniːn/
noun
1.
the aldehyde form of the polyene retinol (vitamin A) that associates with the protein opsin to form the visual purple pigment rhodopsin
Word Origin
C20: from retina + -ene
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Cite This Source
Word Origin and History for retinal
adj.

1838; see retina + -al (1).

Online Etymology Dictionary, © 2010 Douglas Harper
Cite This Source
retinal in Medicine

retinal ret·i·nal (rět'n-āl', -ôl')
n.
See retinaldehyde.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source

Word of the Day

Difficulty index for retinal

Many English speakers likely know this word

Word Value for retinal

7
9
Scrabble Words With Friends