Definition of Spiracle
1. Noun. A breathing orifice.
Definition of Spiracle
1. n. The nostril, or one of the nostrils, of whales, porpoises, and allied animals.
Definition of Spiracle
1. Noun. A pore or opening used (especially by spiders and some fish) for breathing. ¹
2. Noun. The blowhole of a whale. ¹
¹ Source: wiktionary.com
Definition of Spiracle
1. an orifice through which breathing occurs [n -S]
Medical Definition of Spiracle
1.
1. The nostril, or one of the nostrils, of whales, porpoises, and allied animals.
2. One of the external openings communicating with the air tubes or tracheae of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. A tubular orifice communicating with the gill cavity of certain ganoid and all elasmobranch fishes. It is the modified first gill cleft.
3. Any small aperture or vent for air or other fluid.
Origin: L. Spiraculum, fr. Spirare to breathe: cf. F. Spiracule. See Spirit.
Source: Websters Dictionary
(01 Mar 1998)
Lexicographical Neighbors of Spiracle
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