[ ret-n-al, -awl ]
/ ˈrɛt nˌæl, -ˌɔl /
an orange pigment, C20H28O, that is the active component of rhodopsin and is liberated upon the absorption of light in the vision cycle; vitamin A aldehyde.
TAKE THIS QUIZ TO SEE WHAT YOU KNOW ABOUT HIGH SCHOOL PUNCTUATION!
Commas mark divisions in sentences. Periods end declarative sentences. Apostrophes show possession. Easy, right? Well, punctuation can get pretty tricky—fast. Think you got what it takes to be a punctuation expert? Take our quiz to prove it!
Question 1 of 10
Which of the options below is the best punctuation for the sentence? It__s your turn to pick the movie __ but your sister gets to pick the board game we _ re going to play.
Its your turn to pick the movie but your sister gets to pick the board game we’re going to play.
It’s your turn to pick the movie but your sister gets to pick the board game were going to play.
It’s your turn to pick the movie, but your sister gets to pick the board game we’re going to play.TAKE THE QUIZ TO FIND OUT
Also ret·i·nene [ret-n-een] /ˈrɛt nˌin/.
Words nearby retinal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020
British Dictionary definitions for retinene
/ (ˈrɛtɪˌniːn) /
the aldehyde form of the polyene retinol (vitamin A) that associates with the protein opsin to form the visual purple pigment rhodopsin
Word Origin for retinene
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
Medical definitions for retinene (1 of 2)
[ rĕt′n-ēn′ ]
Either of two yellow to red retinal pigments, formed by oxidation of vitamin A alcohols.
Medical definitions for retinene (2 of 2)
[ rĕt′n-ăl′, -ôl′ ]
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.