retinal

1
[ ret-n-uhl ]

adjective
  1. of or relating to the retina of the eye.

Origin of retinal

1
First recorded in 1830–40; retin(a) + -al1

Other definitions for retinal (2 of 2)

retinal2
[ ret-n-al, -awl ]

nounBiochemistry.
  1. 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.

Origin of retinal

2
First recorded in 1940–45; retin(a) + -al3
  • Also ret·i·nene [ret-n-een]. /ˈrɛt nˌin/.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024