SPINY
Spin"y, n.
Defn: See Spinny.
SPIODEA
Spi*o"de*a, n. pl. Etym: [NL., fr. Spio the typical genus.] (Zoöl.)
Defn: An extensive division of marine Annelida, including those that are without oral tentacles or cirri, and have the gills, when present, mostly arranged along the sides of the body. They generally live in burrows or tubes.
SPIRABLE
Spi"ra*ble, a. Etym: [L. spirabilis.]
Defn: Capable of being breathed; respirable. [Obs.] Nash.
SPIRACLE Spir"a*cle, n.Etym: [L. spiraculum, fr. spirare to breathe: cf. F. spiracule. See Spirit.]
1. (Anat.)
Defn: The nostril, or one of the nostrils, of whales, porpoises, and allied animals.
2. (Zoöl.) (a) One of the external openings communicating with the air tubes or tracheæ 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. See Illust. under Coleoptera. (a) A tubular orifice communicating with the gill cavity of certain ganoid and all elasmobranch fishes. It is the modified first gill cleft.