retroreflective

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adjective

of or pertaining to a surface, material, or device (retroreflector) that reflects light or other radiation back to its source; reflective.

Origin:
1850–55; retro- + reflective

Related forms

ret·ro·re·flec·tion, noun

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Retroreflective is always a great word to know.

So is doohickey. Does it mean:

an extraordinary or unusual thing, person, or event; an exceptional example or instance.

a gadget; dingus; thingumbob.

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Example sentences

Retroreflective material reflects light back towards the source.

For nighttime work, similar outside garments shall be retroreflective.

Yellow and white pavement markings shall be retroreflective.

Retroreflective sheeting shall comply with applicable specifications.

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ret·ro·re·flec·tive