electric eye


Origin:
1925–30

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To electric eye
Collins
World English Dictionary
electric eye
 
n
another name for photocell

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
In freeing the arm, the employee tripped an electric eye, causing the robot arm
  to cycle.
One door is a half door with a doorbell on an electric eye.
They then put the electric eye on the machine that made it unnecessary for you
  to position the ledger sheet by turning the roller.
Vehicles approaching the traffic lights cross an electric eye beam starting a
  timer.
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