English
emeraldine
From emerald + -ine.
Formed from emerald + -ine
Ancient Greek σμάραγδος
Latin smaragdus
Vulgar Latin *smaralda
Old French esmeraude ‘emerald (color)’
Middle English emeraude
English emerald
Today it means
noun Any of a class of green dyestuffs that have an oligoaniline structure
Language periods are conventional ranges, not dates for this word.
Etymograph / emeraldine