prusten

Etymology
From the verb.

Noun

 * 1) A sound made by tigers and snow leopards without the intent to threaten, producing a breathy snort by blowing through the nostrils whilst the mouth is closed — a low-frequency equivalent of the purring found in domestic cats.
 * 2) * ibidem, pages 163–164:
 * Prusten is the quietest of tiger calls, a puff through the nose to express friendliness and harmless intentions.
 * Prusten is the quietest of tiger calls, a puff through the nose to express friendliness and harmless intentions.

Verb

 * 1) to snort (especially with laughter)
 * 2) to splutter