e/Polymethine

Information
has gloss	eng: Polymethines are compounds made up from an odd number of methine groups (CH) bound together by alternating single and double bonds. Compounds made up from an even number of methine groups are known as polyenes.
lexicalization	eng: Polymethine
instance of	(noun) any unsaturated aliphatic hydrocarbon olefine, olefin, alkene