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plastron.

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

8 characters2 syllables approx.English language

Meaning & usage

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

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

  3. A man's shirt-bosom.

  4. An ornamental front panel on a woman's bodice.

  5. A breastplate.

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

    The plastron of a diving beetle is not directly a source of oxygen, but acts as a gill, acquiring oxygen from the surrounding water.
Where this word comes from

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”).

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.