A paronychia is an infection of the skin that surrounds a toenail or fingernail. Acute paronychia â This usually appears as a sudden, very painful area of swelling, warmth and redness around a fingernail or toenail, usually after an injury to the area.
Definition of 'reflector'. reflector (rÉªflektÉÊ³ ) A reflector is a small piece of specially patterned glass or plastic which is fitted to the back of a bicycle or car or to a post beside the road, and which glows when light shines on it. A reflector is a type of telescope which uses a mirror that is shaped like a ball.
Definition of parabolic reflector 1 or parabolic mirror: a concave mirror that has the form of a paraboloid of revolution so that rays emanating from the geometrical focus and reflected from the surface are all parallel to each other and to the axis of symmetry and rays from a distant source (as a star) are reflected to the focus and that is used in reflecting telescopes, searchlights, and headlights