The organ of sight; an eye.

Of, pertaining to, or using vision or sight; as, optical illusions.

Of or pertaining to the eye; ocular; as, the optic nerves (the first pair of cranial nerves) which are distributed to the retina; the optic (or optical) axis of the eye. See Illust. of Brain, and Eye.

Relating to the science of optics or to devices designed to assist vision; as, optical works; optical equipment.

The visual effect of thicker and thinner clear glass. Also the metal mold with ridges inside into which the hot glass on the pipe is pushed leaving an impression which remains as the glass is worked, producing optical effects. The mold is straight, but the ridges in the glass may be twisted in working. After twisting, the glass may be reheated and returned to the mold for a diamond effect. Glass stringer may be placed in the notches of the mold to apply uniformly spaced lines around the piece on the ridges.

A cylinder, open or closed on the bottom, with even ridges around the inside, used to produce optical effects and air stems. Chills glass which can then be twisted, etc., and pattern remains in glass. Also used for applying threads of color, which are carefully laid inside the optic before the glass inserted. Usually aluminum, almost impossible to home make, Steinert offers two dozen varieties at $45-100. Almost anything with an even pattern inside (a spline in a gear) can be used.

Type of antimicrobial agent made from a mold or a bacterium that kills, or slows the growth of other microbes, specifically bacteria. Examples include penicillin and streptomycin.

Alternative physical method to communicate information. Instead of using metal wires to pass data, fine plastic or glass tubing is used to pass light from an LED at one end to receiver at the other end. This method is useful for avoiding noise (interference) common with electric metal wire communication.