spiracles

n. air hole, opening which allows the passage of air; (Zoology) respiratory aperture (as in whales, sharks, spiders, etc.)

Spiracles are small openings on the surface of some animals that usually lead to respiratory systems.In elasmobranchs (sharks and rays), a spiracle is found behind each eye, and is often used to pump water through the gills while the animal is at rest (Fouts, 2003). A spiracle is also found in primitive bony fishes as the bichir.
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Noun
1. a breathing orifice
(hypernym) orifice, opening, porta
(hyponym) blowhole

ORIFIZI PER LA RESPIRAZIONE. SFIATATOI. STIGMI. SPIRACOLI