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Definition of: neurasthenia
(n
r′əs·thē′nē·ə, -thēn′yə, nyr′-) noun
1. Pathol. Derangement of the nervous system with depression of vital force; nervous prostration.
2. Psychoanal. A neurosis characterized by physical disorder, as headache, constipation, etc., originated by inadequate expression of the libido. [<NL <Gk. neuron a nerve + asthenia weakness]
—neu′ras·then′ic (-then′ik) adjective & noun
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