optoelectronics

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op·to·e·lec·tron·ics

 (ŏp′tō-ĭ-lĕk′trŏn′ĭks, -ē′lĕk-)
n. (used with a sing. verb)
The branch of physics that deals with the interconversion of electricity and light.

[Greek optos, visible; see okw- in Indo-European roots + electronics.]

op′to·e·lec′tron′ic adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

optoelectronics

(ˌɒptəʊɪlɛkˈtrɒnɪks)
n
(Electrical Engineering) (functioning as singular) the study or use of devices in which an optical input produces an electrical output, or in which electrical stimulation produces visible or infrared output
ˌoptoelecˈtronic adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

op•to•e•lec•tron•ics

(ˌɒp toʊ ɪ lɛkˈtrɒn ɪks, -ˌi lɛk-)

n. (used with a sing. v.)
the branch of electronics dealing with devices that generate, transform, transmit, or sense optical, infrared, or ultraviolet radiation, as solar cells and lasers.
[1955–60]
op`to•e•lec•tron′ic, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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Opto Electronics Inc., Syracuse, N.Y., mounts over a non-rubber-coated roll and detects sudden changes in web material thickness due to mill or butt-type splices.