visual aid

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Also see: aid

Concise Oxford English Dictionary © 2008 Oxford University Press:
visual /ˈvɪʒjʊəl, -zj-/

▶adjective relating to seeing or sight. ▶noun a picture, piece of film, or display used to illustrate or accompany something.

– derivatives
visuality noun,
visually adverb.

– origin ME (orig. describing a supposed beam proceeding from the eye and making vision possible): from late L. visualis, from L. visus ‘sight’, from videre ‘to see’.