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specular (adj.)

1570s, "reflective" (like a mirror), from Latin specularis, from speculum "a mirror" (see speculum). Meaning "assisting in vision; affording a view" is from 1650s, from Latin speculari "to spy" (see speculation).

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Definitions of specular from WordNet

specular (adj.)
capable of reflecting light like a mirror;
a specular metal
Synonyms: mirrorlike
From wordnet.princeton.edu