atrial

Etymology

It is formed from English atrium + -al,^[2][3][4][5] or, as the revised OED allows, directly from Latin ātrium with the English suffix.^[2] The Latin noun meant the central court or first main room of a house, the room with the hearth, and goes back to Proto-Italic *atro-.^[3] Varro called it an Etruscan word,^[3][6] and Klein connects it with the Etruscan town of Atria, the supposed home of this style of building, calling the link with āter (“black, dark”) a folk etymology.^[6] Watkins derives it from Proto-Indo-European *āter- (“fire”), as the place where the smoke of the hearth escaped;^[3][7] de Vaan finds this unconvincing and prefers a root meaning "fireplace", with cognates in Old Irish aith, Welsh odyn (“furnace, oven”) and Avestan atarš (“fire”).^[3]

Earliest recorded meaning

Of or relating to an atrium, chiefly in anatomy: 1859, in the Philosophical Transactions of the Royal Society.^[2] Etymonline dates it by 1860, of the atria of the heart,^[3] and the 1989 edition of the OED to 1869.^[8]

Semantic evolution

The adjective follows the senses of atrium, which in English named first the hall of a Roman house and the court in front of a church (from 1577),^[2][4] and later cavities of the body, such as the upper chambers of the heart and a cavity in the tunicates.^[2] The revised OED defines atrial for an atrium in these various, mainly anatomical senses, and specifically for the atria of the heart, comparing auricular.^[2] Merriam-Webster Unabridged notes that it is often used in combination, as in sinoatrial.^[4]

Timeline

• 1859 – of or relating to an atrium, chiefly in anatomy.^[2] The 1989 edition of the OED dated it to 1869.^[8]

Meanings

Adjective

1. (anatomy) Of or relating to an atrium, especially one of the two upper chambers of the heart: atrial fibrillation.^[4][2][1]

Word family

• interatrial
• sinoatrial
• atrial natriuretic peptide

Related words

• atrium

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
5. ^ Gove, Philip Babcock, ed. (1961), Webster's Third New International Dictionary of the English Language, Unabridged, Springfield, Mass.: G. & C. Merriam
6. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
8. ^ a b Simpson, J. A.; Weiner, E. S. C., eds. (1989), The Oxford English Dictionary, 2nd ed., Oxford: Clarendon Press