Where does “-cain-” come from?

-cain- (English) comes from English lidocaine, from English acetanilide, from English anilide, from English aniline, from English anil, from Portuguese anil, from Arabic نِيل, from Persian نیل — to lead.

Ancestry of “-cain-”, step by step

StepLanguageWordMeaning
1EnglishlidocaineA crystalline compound, that is used in the form of its hydrochloride as a local anesthetic and as an antiarrhythmic agent
2Englishacetanilidethe amide derived from acetic acid and aniline;...
3EnglishanilideAny organic compound derived from an oxoacid by...
4EnglishanilineThe simplest aromatic amine, CHNH, synthesized by...
5EnglishanilThe indigo shrub; or the indigo dye obtained from...
6Portugueseanilindigo
7Arabicنِيلindigo
8Persianنیلindigo
9Arabicنيلverbal noun of نَالَ; indigo; to colour indigo
10Middle Persian𐭭𐭩𐭫indigo
11Sanskritनीलof a dark color
12Proto-Indo-EuropeanneyH-to lead

Words derived from “-cain-

Every word from Proto-Indo-European neyH-Every word from Sanskrit नीलEvery word from Middle Persian 𐭭𐭩𐭫