spiracle

[ spahy-ruh-kuh l, spir-uh- ]
/ ˈspaɪ rə kəl, ˈspɪr ə- /

noun

a breathing hole; an opening by which a confined space has communication with the outer air; air hole.
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.

Origin of spiracle

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

OTHER WORDS FROM spiracle

spi·rac·u·lar [spahy-rak-yuh-ler, spi-] /spaɪˈræk yə lər, spɪ-/, adjective pre·spi·rac·u·lar, adjective

Words nearby spiracle

spiny-finned, spiny-headed worm, spiny-rayed, spiny-rayed fish, spir-, spiracle, spiradenoma, spiraea, spiral, spiral arm, spiral bandage

Example sentences from the Web for spiracle

British Dictionary definitions for spiracle

spiracle
/ (ˈspaɪərəkəl, ˈspaɪrə-) /

noun

any of several paired apertures in the cuticle of an insect, by which air enters and leaves the trachea
a small paired rudimentary gill slit just behind the head in skates, rays, and related fishes
any similar respiratory aperture, such as the blowhole in whales
geology a protrusion of sediment into a lava flow, formed by the explosive transition of water into steam

Derived forms of spiracle

spiracular (spɪˈrækjʊlə), adjective spiraculate, adjective

Word Origin for spiracle

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

Scientific definitions for spiracle

spiracle
[ spĭr′ə-kəl, spī′rə- ]

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.