An alternative spelling of codeine, a mild opioid pain reliever and cough suppressant commonly found in medicines.
Variant spelling of codeine, which derives from French 'codéine,' itself from Greek 'kodeia' (poppy head). The '-in' suffix is characteristic of alkaloid and chemical compound names.
Different spelling, same substance—codein vs. codeine is like how some words have British and American versions, except this happens in chemistry where old and new naming conventions coexist!
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