hyoplastron.
The second lateral plate in the plastron of turtles.
Meaning & usage
The second lateral plate in the plastron of turtles.
Where this word comes from
Coined by Thomas Henry Huxley in 1872 as hyo- + plastron. Superseded the earlier hyosternum, a nominalised form of the French adjective hyosternal, coined by Étienne Geoffroy Saint-Hilaire in 1818. The prefix is from Ancient Greek ῡ̔οειδής (hūoeidḗs, “shaped like the letter Υ”), ultimately from ὗ (hû, “the Greek letter upsilon”), reflecting its original description as the sternal attachment of the sternohyoid muscle (whose other attachment is on the hyoid bone).
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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.