Standard Lemma guide

cofferdam

noun · 4 senses · updated from the 2026-07-25 local source snapshot

Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.

Sound

Pronunciation

Each Play button uses your device's default local English voice, or a natural local fallback. The selected voice name appears after playback. This is synthesized speech, not a source recording.

  • General-American: /ˈkɑ.fɚ.dæm/
  • Received-Pronunciation: /ˈkɒ.fə.dæm/
  • UK: Recorded audio is listed in the source snapshot.
  • rhymes with -æm

1

noun

Meaning 1

A temporary watertight enclosure used to create a dry foundation for building bridges and other structures over water.

Definition source: English Wiktionary via Wiktextract

Topics: engineering, natural-sciences, physical-sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: coffer, caisson

Antonyms: none provided

Broader terms: enclosure, barrier, dam, structure, protection

2

noun

Meaning 2

An empty space that acts as a protective barrier between two floors or bulkheads on a ship.

Definition source: English Wiktionary via Wiktextract

Topics: nautical, transport

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

Synonym of dental dam (“barrier to keep the teeth dry during dental work”) (dental sense).

Definition source: English Wiktionary via Wiktextract

Usage: obsolete

Topics: dentistry, medicine, sciences

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: dental dam

Antonyms: none provided

4

noun

Meaning 4

large watertight chamber used for construction under water

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: caisson, pneumatic caisson

Antonyms: none provided

Broader terms: chamber

History

Etymology

From coffer + dam. The dental dam sense was introduced in English by dentist Sanford Christie Barnum at New York City in 1864 (by metaphor), but after his century it was maintained only in languages other than English (for example, German Kofferdam as a loanword from 19th-century English).

Across languages

Translations

11 source translations are retained for this English entry.

  • Danish: cellefangedæmning — temporary watertight structure
  • Dutch: kistdam — temporary watertight structure
  • Finnish: arkkupato — temporary watertight structure
  • French: batardeau — temporary watertight structure
  • German: Kofferdamm — temporary watertight structure
  • Italian: tura — temporary watertight structure
  • Italian: cassone — temporary watertight structure
  • Polish: koferdam — temporary watertight structure
  • Polish: grobla — temporary watertight structure
  • Spanish: ataguía — temporary watertight structure
  • Ottoman Turkish: صندوق (sanduk, sandık) — temporary watertight structure