distance

(dis’tans). The length of space between two objects. angular d., the aperture of the angle made at the eye by lines drawn from the eye to two objects. focal d., the distance from a focus to a refracting or reflecting surface, or, in the case of a lens, to the principal point of the lens. infinite d., in ophthalmology, a distance of twenty feet or more: so called because rays entering the eye from an object at that distance are practically as parallel as if they came from a point at an infinite distance. working d., the distance between the front lens of a microscope and the object when correctly focused. Gis temper (dis-tem’per). A name of several infectious diseases of animals: especially, a contagious catarrhal disease of pups caused by a specific bacillus. colt d. Same as strangles.