1. A poisonous alkaloid of a very acrid taste, obtained from tobacco.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• nicatine,
• nicitine,
• niccotine,
• vicodine,
• nicitone,
• nicotined,
• nictotine,
• nictone,
• nicotien,
• nicotiene,
• ninetine,
• nicodine,
• nicotein,
• vicotin,
• nictine,
• nicoten,
• nigotine,
• nicotene,
• nicotin,
• nictoine

• nicotiana.

The adjective form of the word "nicotine" is "nicotinic".

The plural form of the word "nicotine" is also "nicotine" as it does not change in the plural form.

The singular form of the word "nicotine" is "nicotine".