Etymology
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spiracle (n.)

"air hole," 1610s, from Latin spiraculum "breathing hole," from spirare "to breathe" (see spirit (n.)). Related: Spiracular.

updated on November 08, 2013

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Definitions of spiracle from WordNet

spiracle (n.)
a breathing orifice;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.