means A smooth reflective surface, usually glass backed with metal, that bounces light back to show you your own image.

from From Old French 'mirour,' from Vulgar Latin 'mirare' (to look at, to wonder at), a cousin of Latin 'mirari' (to marvel) — the same root that gives us 'miracle' and 'admire.' Buried in the word is the old idea that gazing into a reflection is an act of wonder, not just grooming.