AXIS n.
-- Optic axis of a crystal, the direction in which a ray of transmitted light suffers no double refraction. All crystals, not of the isometric system, are either uniaxial or biaxial. -- Optic axis, Visual axis (Opt.), the straight line passing through the center of the pupil, and perpendicular to the surface of the e…
BAR n.
ross the usual opening at the heel, to protect a tender frog from injury. -- Bar shot, a double headed shot, consisting of a bar, with a ball or half ball at each end; -- formerly used for destroying the masts or rigging in naval combat. -- Bar sinister (Her.), a term popularly but erroneously used for baton, a mark…
BELLY n.
The hollow part of a curved or bent timber, the convex part of which is the back. Belly doublet, a doublet of the 16th century, hanging down so as to cover the belly. Shak. -- Belly fretting, the chafing of a horse's belly with a girth. Johnson. -- Belly timber, food. [Ludicrous] Prior. -- Belly worm, a worm that br…