LATIN DICTIONARYLexicon Latīnum
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“alarm” in Latin

The English word alarm itself goes back to Latin arma.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

alarm s.
ad arma! (call to arms). To give or sound an alarm, conclamare ad arma. ImPROP., disturbance: turba (noise, confusion, wild disorder): tumultus, tumultuatio (noisy uproar, whether of an excited multitude or of an individual: then, like trepidatio, the fear, etc., caused by it), strepitus (roaring, bawling noise). (The words are found in this connection and order.), strepitus et tumultus. A false alarm, tumultus vanus. To raise an alarm about nothing, excitare fluctus in simpulo (proverbially, Cic., De Legg., 3, 16, 36). To make an alarm, tumultuari: tumultum facere: strepere. To give an alarm of anything, clamare, proclamare, clamitare aliquid: of fire, ignem or incendium conclamare (Sen., De Ir., 3, 43, 3). To be in alarm, trepidare. There is terror and alarm every where, omnia terrore ac tumultu strepunt (Liv.). The whole house is in alarm and confusion, miscetur domus tumultu (Verg., Aen., 2, 486).
Fear, Vid.
alarm v.
PROP., to call to arms, conclamare, ad arma!
Disturb, turbare, conturbare: perturbare: miscero, commiscere: confundere: concitare.
Disturb with apprehension, commovere; sollicitare; sollicitum facere: turbare, conturbare, perturbare. This alarms me, hoc male me habet; hoc me commovet, pungit: alarms me exceedingly, est aliquid mihi maximo terrori.

Quick answer

What is the Latin word for alarm?
The usual Latin words for “alarm” are turba, tumultus, tŭmultŭātĭo; also strepitus, tumultuor, strepō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.