Noun

1. Finely ground or pulverized tobacco intended for use by being sniffed or snorted into the nose.
2. Fine-ground or minced tobacco, dry or moistened, intended for use by placing a pinch behind the lip or beneath the tongue.
   • 1896, Universal Dictionary of the English Language:

     Dry snuffs are often adulterated with quicklime, and moist snuffs, as rappee, with ammonia, hellebore, pearl-ash, etc.

3. A snort or sniff of fine-ground, powdered, or pulverized tobacco.
4. The act of briskly inhaling by the nose; a sniff, a snort.
5. Resentment or skepticism expressed by quickly drawing air through the nose; snuffling; sniffling.
6. Snot, mucus.
7. Smell, scent, odour.

Noun

1. The burning part of a candle wick, or that which has been charred by the flame, whether burning or not.
2. Leavings in a glass after drinking; heel-taps.

Verb

1. To extinguish a candle or oil-lamp flame by covering the burning end of the wick until the flame is suffocated.
2. To kill a person; to snuff out.