<p><strong>Verb</strong></p><ul><li>(Used without object) To draw air through the nose in short, audible inhalations.</li><li>To clear the nose by so doing; sniffle.</li><li>To smell by short inhalations.</li><li>To show disdain, contempt, etc., by or as by sniffing.</li><li>(Used with object) To perceive by or as by smelling; to sniff a scandal.</li><li>To inhale through the nose; to sniff the air.</li></ul><p><strong>Noun</strong></p><ul><li>An act of sniffing; a single, short, audible inhalation.</li><li>The sound made by such an act.</li><li>A scent or odor perceived; a sniff of perfume.</li></ul>