| biauriculate | 1. <anatomy> Having two auricles, as the heart of mammals, birds, and reptiles. 2. <botany> Having two earlike projections at its base, as a leaf. Origin: Pref. Bi- + au riculate. Source: Websters Dictionary (01 Mar 1998) |
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| biaxial | <optics> Having two axes; as, biaxial polarization. Source: Websters Dictionary (01 Mar 1998) |
| biaxial crystals | <microscopy> Anisotropic crystals in the orthorhombic, monoclinic and triclinic systems. They have three principal refractive indices alpha, beta, and gamma, and two isotropic directions, i.e., optic axes. Bifilar eyepiece. An ocular with two crossed hairs, wires, filaments or threads each of which has perpendicular motion. (05 Aug 1998) |
| biaxial joint | One in which there are two principal axes of movement situated at right angles to each other; e.g., saddle joint's. (05 Mar 2000) |