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light organ
light out
light pen
light pipe
light plane
light pollution
light railway
light reaction
light reflex
light saber
light-sensitive
light shelf
light show
light-struck
light stylus
light truck
light up
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light reflex
light re·flex (plural light re·flex·es)


noun 
Definition:
 
reaction of pupil to increased light: the normal contracting of the pupil of the eye in response to increased light
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Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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