Standard Lemma guide

plastron

noun · 11 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

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  • /ˈplæstɹən/
  • US: Recorded audio is listed in the source snapshot.
  • rhymes with -æstɹən

1

noun

Meaning 1

The nearly flat part of the shell structure of a tortoise or other animal, similar in composition to the carapace.

Definition source: English Wiktionary via Wiktextract

Topics: biology, natural-sciences, zoology

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

2

noun

Meaning 2

A half-jacket worn under the jacket for padding or for safety.

Definition source: English Wiktionary via Wiktextract

Topics: fencing, government, hobbies, lifestyle, martial-arts, military, politics, sports, war

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

3

noun

Meaning 3

A man's shirt-bosom.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

4

noun

Meaning 4

An ornamental front panel on a woman's bodice.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

5

noun

Meaning 5

A breastplate.

Definition source: English Wiktionary via Wiktextract

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

6

noun

Meaning 6

A film of air trapped by specialized hairs against the body of an aquatic insect, and which acts as an external gill.

Definition source: English Wiktionary via Wiktextract

Examples

  • The plastron of a diving beetle is not directly a source of oxygen, but acts as a gill, acquiring oxygen from the surrounding water.
  • 2013, Jon F. Harrison, Lutz T. Wasserthal (revisions & updates), 17: Gaseous Exchange, R. F. Chapman, Stephen J. Simpson (editor), Angela E. Douglas (editor), The Insects: Structure and Function, 5th Edition, page 535, The plastrons of other insects are generally less efficient than that of Aphelocheirus as they have a less dense hair pile from which the air is more readily displaced.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

7

noun

Meaning 7

(zoology) the part of a turtle's shell forming its underside

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: exoskeleton

8

noun

Meaning 8

a large pad worn by a fencer to protect the chest

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: pad

9

noun

Meaning 9

a metal breastplate that was worn under a coat of mail

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: breastplate, aegis, egis

10

noun

Meaning 10

the front of man's dress shirt

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: shirtfront

11

noun

Meaning 11

the ornamental front of a woman's bodice or shirt

Definition source: Princeton WordNet 3.0

No example sentence was provided for this meaning.

Meaning relationships

Synonyms: none provided

Antonyms: none provided

Broader terms: shirtfront

History

Etymology

Borrowed from French plastron, from Italian piastrone, augmentive of piastra (“breastplate”), from Latin emplastrum (“plaster”), from Ancient Greek ἔμπλαστρον (émplastron), from ἔμπλαστος (émplastos, “daubed, plastered”), from ἔμπλασσειν (émplassein, “to mould, form”).

Across languages

Translations

14 source translations are retained for this English entry.

  • Finnish: rintapanssari — part of the shell structure of a tortoise
  • Finnish: plastroni — part of the shell structure of a tortoise
  • Italian: piastrone — part of the shell structure of a tortoise
  • Polish: plastron — part of the shell structure of a tortoise
  • Portuguese: plastrão — part of the shell structure of a tortoise
  • Russian: пластро́н (plastrón) — part of the shell structure of a tortoise
  • Finnish: suojaliivi — fencing
  • Finnish: plastron — fencing
  • Polish: plastron — fencing
  • Finnish: miehusta — men's shirt bosom
  • Polish: plastron — men's shirt bosom
  • Finnish: rintapanssari — breastplate
  • Polish: plastron — breastplate
  • Polish: plastron — film of air trapped by specialized hairs against the body of an aquatic insect