pertaining to or having the properties of a mirror.
pertaining to a speculum.
Optics. (of reflected light) directed, as from a smooth, polished surface (opposed to diffuse ).

1570–80; < Latin speculāris, equivalent to specul(um) a mirror (spec(ere) to look, regard + -ulum instrumental suffix; see -ule) + -āris -ar1

specularly, adverb
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World English Dictionary
specular (ˈspɛkjʊlə)
1.  of, relating to, or having the properties of a mirror: specular reflection
2.  of or relating to a speculum
[C16: from Latin speculāris, from speculum a mirror, from specere to look at]

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Example sentences
It is possible to set the ambient, diffuse and specular colors separately.
Standards for optical properties of specular glazing materials are well established.
Initial hemispherical and specular reflectivity was low due to a vacuum problem during the manufacturing process.
Independent movement of both sample and detector allows measurement of off-specular scattering.
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