( n. )
Derangement of the mind in regard of a single subject only; also, such a concentration of interest upon one particular subject or train of ideas to show mental derangement.
( n. )
Derangement of the mind in regard of a single subject only; also, such a concentration of interest upon one particular subject or train of ideas to show mental derangement.
Webster's Revised Unabridged English Dictionary. Пересмотренный полный словарь английского языка Webster. 2012