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Originally: displacement of a sensation of touch to a different point on the same side of the body as that to which the stimulus was applied; compare allochiria . In later use: = allaesthesia .
Late 19th century. From ancient Greek ἀλλαχῇ elsewhere (from ἄλλος other + -αχῇ (in e.g. τετραχῇ in four parts)) + -αισθησία (in ἀναισθησία; compare also Hellenistic Greek δυσαισθησία).