from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The major metabolite of nicotine that indicates levels of nicotine intake.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A metabolite of nicotine that may improve mental ability.
from The Century Dictionary and Cyclopedia
- n. A crystalline alkaloid, C10H12ON2, obtained indirectly from nicotine. It melts at 50° C.
Probably (ni)cotin(e) + -ine2.(American Heritage® Dictionary of the English Language, Fourth Edition)
Anagram of nicotine. (Wiktionary)