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.
A small reaction, called an induration, at the site of the test (5 to 9 mm of firm swelling) is a positive result in people who: 1  take steroids. 2  have HIV.