photobeam

名词 n.
中文释义

英文释义

名词 n.
  1. A beam of light whose interruption triggers a warning or a mechanism (such as a door).

词形变化

photobeams plural photo beam alternative

词源

Etymology tree
Proto-Indo-European *bʰeh₂-
Proto-Indo-European *bʰéh₂os
Proto-Hellenic *pʰáwos
Ancient Greek φᾰ́ος (phắos)
Ancient Greek φῶς (phôs)
Ancient Greek φωτο- (phōto-)der.
English photo-
Proto-Germanic *bagmaz?
Proto-West Germanic *baum
Old English bēam
Middle English beem
English beam
English photobeam
From photo- + beam.
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