WordNet (r) 3.0 (2006):

snorkel
    n 1: breathing device consisting of a bent tube fitting into a
         swimmer's mouth and extending above the surface; allows
         swimmer to breathe while face down in the water
    2: air passage provided by a retractable device containing
       intake and exhaust pipes; permits a submarine to stay
       submerged for extended periods of time [syn: snorkel,
       schnorkel, schnorchel, snorkel breather, breather]
    v 1: dive with a snorkel