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n, as in the air waves constituting sound, but transversely, and the various phenomena of refraction, polarization, interference, etc., are attributable to the different affections of these undulations in different circumstances of propagation. It is computed that the frequency of the undulations corresponding to the s…

Having but one optic axis, or line of no double refraction.

submissive to rule; disregarding restraint; disposed to violate; turbulent; ungovernable; refractory; as, an unruly boy; unruly boy; unruly conduct. But the tongue can no man tame; it is an unruly evil, full of deadly poison. James iii. 8.

To recant or recall, as what has been said; to refract; to take back again; to make as if not said. You can say and unsay things at pleasure. Goldsmith.

Not well tamed or broken; given to bad tricks; unruly; refractory; as, a vicious horse.

focus (Opt.), the point from which rays, having been rendered divergent by reflection of refraction, appear to issue; the point at which converging rays would meet if not reflected or refracted before they reach it. -- Virtual image. (Optics) See under Image. -- Virtual moment (of a force) (Mech.), the product of th…

ght from an object fall upon the peripheral parts of the retina. -- Reflected vision, or Refracted vision, vision by rays reflected from mirrors, or refracted by lenses or prisms, respectively. -- Vision purple. (Physiol.) See Visual purple, under Visual.

ce of light in the interior of crystals. It is used in explaining the phenomena of double refraction. See under Refraction. -- Wave theory. (Physics) See Undulatory theory, under Undulatory.

verned by the will without yielding to reason; obstinate; perverse; inflexible; stubborn; refractory; as, a willful man or horse. -- Will"ful*ly, adv. -- Will"ful*ness, n.