| spirochaeta | (n) the type genus of the family Spirochaetaceae; a bacterium that is flexible, undulating, and chiefly aquatic, Syn. genus Spirochaeta |
| spirochaetaceae | (n) large coarsely spiral bacteria; free-living in fresh or salt water or commensal in bodies of oysters, Syn. family Spirochaetaceae |
| spirochaetales | (n) higher bacteria; slender spiral rodlike forms, Syn. order Spirochaetales |
| spirochete | (n) parasitic or free-living bacteria; many pathogenic to humans and other animals, Syn. spirochaete |
| spirodela | (n) minute aquatic herbs floating on the water surface consisting of a shiny leaflike frond and 2-21 roots, Syn. genus Spirodela |
| spirogram | (n) a recording of breathing made with a spirograph |
| spirograph | (n) a measuring instrument for recording the depth and rapidity of breathing movements |
| spirogyra | (n) freshwater algae consisting of minute filaments containing spiral chlorophyll bands |
| spirometer | (n) a measuring instrument for measuring the vital capacity of the lungs |
| spirometry | (n) the use of a spirometer to measure vital capacity |
| Spirobacteria | ‖n. pl.; sing. Spirobacterium /sing>. [ NL. See 4th Spire, and Bacterium. ] (Biol.) See the Note under Microbacteria. [ 1913 Webster ] |
| Spirochaete | { ‖‖ } n. [ L. spira a coil + Gr. &unr_;&unr_;&unr_; hair. ] (Biol.) A genus of Spirobacteria similar to Spirillum, but distinguished by its motility. One species, the Spirochaete Obermeyeri, is supposed to be the cause of relapsing fever. [ 1913 Webster ] Variants: Spirochaeta |
| Spirograph | n. [ L. spirare to breathe + -graph. ] (Physiol.) An instrument for recording the respiratory movements, as the sphygmograph does those of the pulse. [ 1913 Webster ] |
| Spirometer | n. [ L. spirare to breathe + -meter. ] An instrument for measuring the vital capacity of the lungs, or the volume of air which can be expelled from the chest after the deepest possible inspiration. Cf. Pneumatometer. [ 1913 Webster ] |
| Spirometry | n. The act or process of measuring the chest capacity by means of a spirometer. [ 1913 Webster ] |
| Spiroscope | n. [ L. spirare to breathe + -scope. ] (Physiol.) A wet meter used to determine the breathing capacity of the lungs. [ 1913 Webster ] |
| Spiroylous | { } a. [ NL. Spir&unr_; meadowsweet (a source of salicylal) + -yl + -ic, -ous. ] (Chem.) Pertaining to, or designating, a substance now called salicylal. [ Obs. ] [ 1913 Webster ] Variants: Spiroylic |
