retinylidene
/rɛtɪˈnɪlɪdiːn/ /rɛtɪˈnʌɪlɪdiːn/Biochemistry
noun
A radical or group derived from retinal and present in rhodopsin as a side chain linked by a double bond between the aldehyde group of retinal and an amino group of opsin. Usually attributive.
Origin
1960s; earliest use found in Proceedings of the Royal Society of London. From retin- + -ylidene.