involutional

involutional

[in-vuh-loo-shuh-nl]
adjective
1.
of, pertaining to, or characteristic of involutional melancholia: involutional symptoms.
noun
2.
a person who suffers from involutional melancholia.

Origin:
1905–10; involution + -al1

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World English Dictionary
involution (ˌɪnvəˈluːʃən)
 
n
1.  the act of involving or complicating or the state of being involved or complicated
2.  something involved or complicated
3.  zoology degeneration or structural deformation
4.  biology an involute formation or structure
5.  physiol reduction in size of an organ or part, as of the uterus following childbirth or as a result of ageing
6.  Compare evolution an algebraic operation in which a number, variable, expression etc, is raised to a specified power
7.  grammar an involved construction, such as one in which the subject is separated from the predicate by an additional clause
 
invo'lutional
 
adj

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