alarum

Noun

WordNet 3.0

Noun (1)

  1. an automatic signal (usually a sound) warning of dangerSynonyms: alarmalertwarning signal
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Webster's Dictionary (GCIDE)

Alarum \A*lar"um\ (?; 277), n. [OE. alarom, the same word as alarm, n.] See Alarm. [Now Poetic] [1913 Webster]

Note: The variant form alarum is now commonly restricted to an alarm signal or the mechanism to sound an alarm (as in an alarm clock.) [1913 Webster]

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