mirror: [13] Mirror belongs to a small family of English words which illustrate how a Latin term originally signifying ‘wonder at’ weakened (presumably via ‘stare in wonder at’) to ‘look at’. Etymologically, a mirror is something you ‘look at’ yourself in. The word comes via Old French mirour from Vulgar Latin *mīrātōrium, a derivative of *mirāre ‘look at’.
This was closely related to classical Latin mīrārī ‘wonder at’ (a derivative of mīrus ‘wonderful’), which passed into Old French as mirer ‘look at’, source of English mirage [19]. Based on mīrārī were Latin mīrābilis ‘wonderful’ (source of English marvel [13]) and mīrāculum ‘something to be wondered at’ (source of English miracle [12]). => marvel, miracle, mirage
mirror (n.)
early 13c., from Old French mireoir "a reflecting glass, looking glass; observation, model, example," earlier miradoir (11c.), from mirer "look at" (oneself in a mirror), "observe, watch, contemplate," from Vulgar Latin *mirare "to look at," variant of Latin mirari "to wonder at, admire" (see miracle). Figurative usage is attested from c. 1300. Used in divination since classical and biblical times; mirrors in modern England are the subject of at least 14 known superstitions, according to folklorists. Belief that breaking one brings bad luck is attested from 1777. The Spanish cognate, mirador (from mirar "to look, look at, behold"), has come to mean "watch tower." Mirror ball attested from 1968.
mirror (v.)
"to reflect," 1590s, from mirror (n.). Related: Mirrored; mirroring. The Middle English verb mirouren (early 15c.) meant "to be a model" (for conduct, behavior, etc.), while miren (mid-14c., from Old French mirer) meant "to look in a mirror."