Look up click, klik, or klick in Wiktionary, the free dictionary.
Noun. 1. induration-any pathological hardening or thickening of tissue. sclerosis. disseminated multiple sclerosis, disseminated sclerosis, MS, multiple sclerosis-a chronic progressive nervous disorder involving loss of myelin sheath around certain nerve fibers.
Medical Definition of aspiration. : a drawing of something in, out, up, or through by or as if by suction: asa: the act of breathing and especially of breathing inb: the withdrawal of fluid or friable tissue from the bodyc: the taking of foreign matter into the lungs with the respiratory current.