apse

Etymology

It is borrowed from Latin apsis (“arch, vault, orbit of a heavenly body”), also absis,^[2][3][4][5] with the Latin ending dropped as in base and axe;^[2] Barnhart and Merriam-Webster Unabridged also name Medieval Latin, in which it meant the apse of a church.^[6][4] The Latin word is from Ancient Greek ἁψίς (hapsís), in Ionic without the aspirate, a fastening, the rim of a wheel, then a wheel, arch or vault,^[2][3][7] from ἅπτω (háptō, “to join, fasten”),^[2][3][5] a verb of unknown or uncertain origin.^[3][6] That verb's family also gave synapse and haptic.^[7] The Oxford Dictionary of English and the Shorter Oxford make the link with the verb only a "perhaps",^[8][9] and Merriam-Webster Unabridged tentatively compares verbs for copulating in Greek and Sanskrit.^[4]

Earliest recorded meaning

An extreme point of an orbit, in astronomy: 1822, in T. Webster's edition of Imison's Elements of Science and Art.^[2] Merriam-Webster Unabridged dates this sense to 1715,^[4] and Weekley also says the astronomical use came first.^[10] The architectural sense follows in 1845 in the OED, and in 1846 in Barnhart and Etymonline.^[2][6][3]

Semantic evolution

Ayto traces the Greek sense from the joining of arcs into a circle: the rim of a wheel, then the wheel, then by further metaphor an orbit and an arch or vault.^[5][3] English first took the word in its Latin form apsis, for a planet's orbit in 1601, for either end of its axis in 1658 and for the part of a building in 1706.^[2] The shortened apse repeated the astronomical sense in the early 19th century, but it survived mainly in architecture, leaving apsis to astronomy.^[9][5] Through the place where they stood, the apsis could also stand for a bishop's throne or a reliquary in ancient churches,^[2] and Merriam-Webster Unabridged records the bishop's seat under apse too.^[4]

Timeline

• 1822 – an extreme point of an orbit, in astronomy.^[2] Merriam-Webster Unabridged dates this sense to 1715.^[4]
• 1845 – a vaulted semicircular or polygonal recess in a building, especially a church.^[2][9] Barnhart and Etymonline date it to 1846.^[6][3]

Meanings

Noun

1. A semicircular or polygonal projecting part of a building, usually vaulted or domed, especially at the east end of a church: Candles lit the frescoes in the apse.^[11][4][2]
2. In ancient churches, the bishop's seat or throne placed there.^[4][2]
3. (astronomy) An apsis, either extreme point of an orbit.^[11][4][2]

Word family

• apsidal
• apsidally

Related words

• apsis
• synapse
• haptic

Usage notes

Wright records two unrelated dialect words of this spelling: in Somerset, Devon and Cornwall apse or aps was an abscess or tumour, a corruption of abscess, and in Cheshire it was an exclamation of surprise or reproof, as in apse upon thee!^[12]

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b c d e f g h i Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
5. ^ a b c d Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
6. ^ a b c d Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
7. ^ a b Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
8. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
9. ^ a b c Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
10. ^ Weekley, Ernest (1921), An Etymological Dictionary of Modern English, London: John Murray
11. ^ a b Collins English Dictionary (2023), Glasgow: HarperCollins
12. ^ Wright, Joseph, ed. (1898–1905), The English Dialect Dictionary, 6 vols., Oxford: Henry Frowde; via EDD Online 4.0, University of Innsbruck (CC BY 4.0)