ACHROMATIC a.
said of tissue. Achromatic lens (Opt.), a lens composed usually of two separate lenses, a convex and concave, of substances having different refractive and dispersive powers, as crown and flint glass, with the curvatures so adjusted that the chromatic aberration produced by the one is corrected by other, and light emer…
ANACLASTIC a.
Anaclastic glass, a glass or phial, shaped like an inverted funnel, and with a very thin convex bottom. By sucking out a little air, the bottom springs into a concave form with a smart crack; and by breathing or blowing gently into the orifice, the bottom, with a like noise, springs into its former convex form.…
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…