noun. convulsion characterized by alternating contractions and relaxations.
1. Noun, singular or mass In both of these cases, a stroke or tumor on one side of the brain will cause weakness and clonus on the opposite side of the body. 2. Noun, plural Common causes of clonus are multiple sclerosis, strokes, tumors and trauma. 3. Verb, base form The loss of this material -- a process called demyelination -- disrupts nerve signals between the brain and spinal cord, leading to clonus**.