'non-aphasic' originates from English, specifically the prefix 'non-' + the adjective 'aphasic', where 'non-' meant 'not' and 'aphasic' comes from Greek via New Latin (from 'aphasia').

'non-aphasic' was formed in modern English by attaching the negative prefix 'non-' to 'aphasic'; 'aphasic' itself developed from New Latin/Greek 'aphasia' (Greek a- 'without' + phasis 'speech, utterance'), which entered medical/technical usage and then produced the adjective 'aphasic'.

Initially, the Greek-derived root 'aphasia' referred to 'without speech' or 'loss of speech'; over time the medical sense stabilized as 'loss or impairment of language ability', and 'non-aphasic' came to mean 'not affected by aphasia' (i.e., having normal language function).