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单词 radio alarm
释义

Definition of radio alarm in English:

radio alarm

noun

  • 1A burglar alarm, fire alarm, etc., which transmits a radio signal to a remote location when triggered.

  • 2A facility enabling a radio to be set to switch on automatically at a chosen time; a radio alarm clock.

Origin

1920s; earliest use found in The Atlanta Constitution.

 
 

Definition of radio alarm in US English:

radio alarm

noun

  • 1A burglar alarm, fire alarm, etc., which transmits a radio signal to a remote location when triggered.

  • 2A facility enabling a radio to be set to switch on automatically at a chosen time; a radio alarm clock.

Origin

1920s; earliest use found in The Atlanta Constitution.

 
 
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更新时间：2025/2/5 3:16:31