English
alarmer
From alarm + -er (agent noun suffix) or -er (measurement suffix).
Formed from alarm + -er
Proto-Indo-European *h₂er- ‘to fit, to fix, to put together, to slot’
Middle French alarme
Middle English alarme
English alarm
Today it means
noun One who alarms; one who sounds the alarm.
Language periods are conventional ranges, not dates for this word.
Etymograph / alarmer