spiracle
21spiracle — /ˈspaɪrəkəl / (say spuyruhkuhl), /ˈspɪrəkəl / (say spiruhkuhl) noun 1. a breathing hole; an opening by which a confined space has communication with the outer air; an air hole. 2. Zoology a. an aperture or orifice through which air or water… …
22spiracle — n. air hole. ♦ spiracular, a. ♦ spiraculate, ♦ spiraculiferous, a. having these …
23spiracle — n. (also spiraculum) (pl. spiracles or spiracula) an external respiratory opening in insects, whales, and some fish. Derivatives: spiracular adj. Etymology: L spiraculum f. spirare breathe …
24biforous spiracle — (ARTHROPODA: Insecta) An immature s spiracle having two entrances (air tubes); annular biforous spiracles …
25bilabiate spiracle — (ARTHROPODA: Insecta) An elongate or annular spiracle of certain larvae with a pair of projecting lips interior to the peritreme; one having two lips at the slit like entrance …
26first thoracic spiracle — (ARTHROPODA: Insecta) The mesothoracic spiracle, sometimes dislocated into the posterior part of the prothorax …
27annular spiracle — (ARTHROPODA: Insecta) 1. In immature Lepidoptera and Hymenoptera, simple, ring like spiracles with a single opening with no accessory chambers. 2. In other immature insects, may be biforous, having two small or large accessory or secondary… …
28closing apparatus of a spiracle — (ARTHROPODA: Insecta) One or two movable valves in the spiracular opening or internal constriction closing off the atrium from the trachea …
29posterior spiracle — (ARTHROPODA: Insecta) Spiracles on the caudal segment or the most caudal pair of segments …
30spiracular — spiracle ► NOUN Zoology ▪ an external respiratory opening in insects, cartilaginous fish, and other animals. DERIVATIVES spiracular adjective. ORIGIN Latin spiraculum, from spirare breathe …