carrel

Etymology 1

From Medieval Latin carula, probably from Latin corolla (“little crown”) in the sense of “ring”; or from Middle English caroll, from Medieval Latin carola, from Late Latin carola (“round dance; round object”), from Latin choraula, variant of choraulēs (“flute player”) (further etymology at carol).

noun

1. (architecture) A small closet or enclosure built against a window on the inner side, to sit in for study.
   Carol, or Carrel. A little pew, or closet, in a cloister, to sit and read in. They were common in greater monasteries, as Duram, Gloucester, Kirkham in Yorkshire, &c.; and had their name from the carols, or sentences inscribed on the walls about them, which often were couplets in rhyme. [Carola, Low Latin.] 1822, Edward James Willson, comp., “Carol, or Carrel”, in A Glossary of Technical Terms, Descriptive of Gothic Architecture: Collected from Official Records, Passages in the Works of Poets, Historians, &c. of a Date Contemporay with that Style: And Collated with the Elucidations and Notes of Various Commentators, Glossarists, and Modern Editors. To Accompany the Specimens of Gothic Architecture, by A[gustus] Pugin, – Architect, 3rd edition, London: Printed for J[ohn] Taylor, Architectural Library, 59, High Holborn; J. Britton, Burton Street; and A. Pugin, 34, Store Street, →OCLC, pages 2–3
   An exquisite south-east door is preserved; it is round-headed, of four orders, with a foliated label. A canopied carol or monk's seat, a Pointed crocketed arch within a square case, is seen beside it, succeeded on the south wall by an arcade of trefoiled arches with toothed mouldings. 1860, Mackenzie Walcott, “[The Abbeys of Scotland.] Melrose”, in The Minsters and Abbey Ruins of the United Kingdom: Their History, Architecture, Monuments, and Traditions; with Notices of the Larger Parish Churches and Collegiate Chapels, London: Edward Stanford, 6, Charing Cross, →OCLC, page 257
2. Hence, a partially partitioned space for studying or reading, often in a library.
   He was busy writing his report in a small library carrel.
   I sneaked a look at what the German student in the next carrel was reading. It was Hegel, too—but in English translation! 2011, David Bellos, chapter 19, in Is that a Fish in Your Ear?

Etymology 2

Possibly a variant of quarrel.

noun

1. A square-headed arrow; a quarrel.