English Reference

Word

siren

US/ˈsaɪɹən/

UK/sˈaɪəɹən/

Definitions

01warning device

B1 · Intermediate Countable noun

n. a piece of equipment that makes a very loud, high sound to warn people about danger.

n. an electronic or mechanical device that emits a loud, piercing sound as a signal or alarm.

“The ambulance turned on its siren as it rushed through the heavy traffic.”

“The city tested the air-raid siren every first Monday of the month to ensure the emergency broadcast system remained functional.”

Usage

Often used with verbs like 'sound', 'wail', or 'go off'.

Synonyms

02mythology

B2 · Upper Intermediate Countable noun Literary

n. in ancient Greek stories, a creature that was half-woman and half-bird who sang to trick sailors into crashing their ships.

n. one of several sea nymphs in Greek mythology whose seductive singing lured mariners to destruction on the rocks.

“In the story of the Odyssey, the sailors had to block their ears to avoid the siren's song.”

“The poet draws a parallel between the modern celebrity and the ancient siren, both capable of leading followers to ruin through sheer charisma.”

Synonyms

nymphtemptress

03seductive person

C1 · Advanced Countable noun Literary · Formal

n. a woman who is very attractive but also dangerous or likely to cause trouble.

n. a woman regarded as dangerously seductive or tempting.

“The actress was famous for playing the role of a mysterious siren in spy movies.”

“The protagonist found himself unable to resist the charms of the screen siren, despite knowing her reputation for betrayal.”

Synonyms

femme fataletemptress

04astronomy

C2 · Proficiency Countable noun Science Technical

n. a space event, like two stars crashing, that helps scientists measure how far away things are in the universe.

n. an astrophysical event, such as a compact binary coalescence, used as a distance indicator in cosmology.

“Scientists used the gravitational waves from the siren to measure the expansion of the universe.”

“The detection of a 'standard siren' provided a new, independent method for calculating the Hubble constant with high precision.”

Synonyms

standard siren

Etymology

From Middle English siren, from Old French sereine and Latin Sīrēn, Sīrēna, from Ancient Greek Σειρήν (Seirḗn).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

Idioms

This entry

Exam level
CambridgeCambridgeCambridge English QualificationsThe exam suite from Cambridge University Press & Assessment, from A1 Movers up to C2 Proficiency. The benchmark names double as CEFR labels.B1 PreliminaryIELTSIELTSInternational English Language Testing SystemThe 0–9 band test co-owned by the British Council, IDP, and Cambridge. Used for university entry, work, and migration.4.0–5.0TOEFL iBTTOEFL iBTTest of English as a Foreign Language, Internet-Based TestETS's academic English test, the standard route for US university admissions. Scored 0–120, with a 1–6 scale since 2026.1–6 scale: 3.0–3.544–71TOEICTOEICTest of English for International CommunicationETS's workplace English test, big in Japan and Korea. Listening & Reading scores 10–990 and tops out at C1.550–784
Frequency
Frequent
Level
B1 · Intermediate
Updated

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English Reference