[spahy-ruh-kuhl, spir-uh-]
a breathing hole; an opening by which a confined space has communication with the outer air; air hole.
an aperture or orifice through which air or water passes in the act of respiration, as the blowhole of a cetacean.
an opening in the head of sharks and rays through which water is drawn and passed over gills.
one of the external orifices of the tracheal respiratory system of certain invertebrates, usually on the sides of the body. See diag. under insect.

1300–50; Middle English < Latin spīrāculum air hole, equivalent to spīrā(re) to breathe + -culum -cle2

spiracular [spahy-rak-yuh-ler, spi-] , adjective
prespiracular, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
spiracle (ˈspaɪərəkəl, ˈspaɪrə-)
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
[C14 (originally: breath): from Latin spīrāculum vent, from spīrāre to breathe]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
spiracle   (spĭr'ə-kəl, spī'rə-)  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences for spiracles
Air is taken in through spiracles, openings on the sides of the abdomen.
In more active species, spiracles are also found upon the tibia of the legs.
The tracheae of insects are attached to the spiracles, excluding the head.
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