Definitions of sniff:

  • noun:   sensing an odor by inhaling through the nose
  • verb:   perceive by inhaling through the nose
    Example: "Sniff the perfume"
  • verb:   inhale audibly through the nose
    Example: "The sick student was sniffling in the back row"
  • name:  A surname (very rare: popularity rank in the U.S.: #67735)