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photobeam
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Contents
1
English
1.1
Alternative forms
1.2
Etymology
1.3
Noun
English
edit
Alternative forms
edit
photo beam
Etymology
edit
photo-
+
beam
Noun
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photobeam
(
plural
photobeams
)
A
beam
of
light
whose
interruption
triggers a
warning
or a
mechanism
(such as a door).