WHAT IS A PARONYCHIA. This is an infected ingrown nail. This is generally the result of an ingrown nail piercing the surrounding flesh, bacteria gets into the opening and it becomes infected.
Medical Definition of REFLEX ARC. : the complete nervous path that is involved in a reflex.eflex arc. noun. : the complete nervous path that is involved in a reflex.
arc. 1  Geometry. any unbroken part of the circumference of a circle or other curved line. 2  Also called electric arc. 3  Astronomy. the part of a circle representing the apparent course of a heavenly body. 4  anything bow-shaped. 5  to form an electric arc. 6  to move in a curve suggestive of an arc.