agnosia[ag nō′sē ə, -zē-; -nä′-]
impairment of the ability to recognize familiar objects, sounds, etc., often as the result of a brain lesion
Origin of agnosiaModern Latin ; from Classical Greek a-, not + gnōsis, knowledge + -ia
Loss of the ability to interpret sensory stimuli, such as sounds or images.
Origin of agnosiaGreek agnōsiā, ignorance : a-, without; see a–1 + gnōsis, knowledge (from gignōskein, to know; see gnō- in Indo-European roots).
From Ancient Greek ἀγνωσία (agnōsia, “ignorance”).