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spiracle

[ spahy-ruh-kuhl, spir-uh- ]

noun

  1. a breathing hole; an opening by which a confined space has communication with the outer air; air hole.
  2. Zoology.
    1. an aperture or orifice through which air or water passes in the act of respiration, as the blowhole of a cetacean.
    2. an opening in the head of sharks and rays through which water is drawn and passed over gills.
    3. one of the external orifices of the tracheal respiratory system of certain invertebrates, usually on the sides of the body.


spiracle

/ ˈspaɪərəkəl; spɪˈrækjʊlə; ˈspaɪrə- /

noun

  1. any of several paired apertures in the cuticle of an insect, by which air enters and leaves the trachea
  2. a small paired rudimentary gill slit just behind the head in skates, rays, and related fishes
  3. any similar respiratory aperture, such as the blowhole in whales
  4. geology a protrusion of sediment into a lava flow, formed by the explosive transition of water into steam
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


spiracle

/ spĭrə-kəl,spīrə- /

  1. An opening through which certain animals breathe, such as the blowhole of a whale or one of the openings in the exoskeleton of an insect.


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Derived Forms

  • spiracular, adjective
  • spiˈraculate, adjective
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Other Words From

  • spi·rac·u·lar [spahy-, rak, -y, uh, -ler, spi-], adjective
  • prespi·racu·lar adjective
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Word History and Origins

Origin of spiracle1

1300–50; Middle English < Latin spīrāculum air hole, equivalent to spīrā ( re ) to breathe + -culum -cle 2
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Word History and Origins

Origin of spiracle1

C14 (originally: breath): from Latin spīrāculum vent, from spīrāre to breathe
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Example Sentences

The researchers found that when Tiktaalik slid its palate around, its own spiracles would have expanded, perhaps enhancing its ability to breathe air.

Small capitate processes or organs, observable under the wings of Diptera, attended by a spiracle.

The first cleft is no longer similar to the rest, but has commenced to be metamorphosed into the spiracle.

The external gills project from all the gill-slits including the spiracle.

But the first has already atrophied considerably, and may easily be recognized as the spiracle.

Spiracle, spir′a-kl, n. a breathing-hole: any minute passage.

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