(in gears) teeth having a profile that is the involute of a circle.
[in-vuh-loo-shuh n] /ˌɪn vəˈlu ʃən/ noun 1. an act or instance of involving or entangling; involvement. 2. the state of being involved. 3. something complicated. 4. Botany, Zoology. 5. Biology. retrograde development; degeneration. 6. Physiology. the regressive changes in the body occurring with old age. 7. Grammar. a complex construction in which the subject is […]
[in-vuh-loo-shuh-nl] /ˌɪn vəˈlu ʃə nl/ adjective 1. of, relating to, or characteristic of : involutional symptoms. noun 2. a person who suffers from .
noun, Psychiatry. 1. (formerly) extreme depression related to menopause or, less frequently, the male climacteric. involutional melancholia n. A form of depression that occurs in late middle age, sometimes accompanied by paranoia.
- Involutional psychosis
involutional psychosis n. A mental disturbance occurring during menopause or later life, characterized chiefly by depression.