uni auriculate animals

pl. Zool.: The Gasteropod a. ( Ro iter.) u-ni-ax-al, u-ni-ax-i-al, a. [Pref. uni-, and Eng. axial .] 1. Biol .: Developed from a single axis, as is the case with all vertebrate animals, some molluscs and annulosa, and some plants. ( Ro iter .) 2. Optics & Crystall .: Having one direction within the crystal, along which a ray of light can proceed without being bifurcated. "The colored rays of uniaxial and biaxial crystals."Proc. of Phys. Soc. London, pt. ii., p. 3. The crystals of Iceland spar, quartz, and tourmaline are uniaxial. Brewster has shown that in all uniaxial crystals the optic axis coincides with the axes of crystallization. When the ordinary refractive index exceeds the extraordinary index the crystal is said to be negative, when it falls short of it the crystal is said to be positive. Iceland spar, tourmaline, sapphire, ruby, ., have negative, and quartz, ice, titanite, ., positive uniaxial crystals. *ū-ni-běr, s. [Etym. doubtful.] The face-guard of a helmeer given *u-nic, s . [UNIQUE.] *u-ni-căm-er-al, adj . [Latin unus one, and camera a chamber.] Consisting of a single chamber. (Said of a legislative body.) u-ni-căp-su-lar, adj . [Pref. uni- , and English capsular. Bot .: Having but a single capsule. ū-ni-car-di-um, s. [Pref. uni- , and Mod. Latin cardium (q. v.).] Palcont .: A doubtful sub-genus of Corbis, having the shell thin, oval, and concentrically striated; the hinge with an obscure tooth or edentulous. Known species forty, from the Lias to the Portland Rock. ( Woodward .)