noun

• (architecture, obsolete) Alternative spelling of carol (“a small closet or enclosure built against the inner side of a window of a monastery's cloister, to sit in for study”).
  "And in every wyndowe iij Pewes or Carrells, where every one of the old Monks had his carrell, severall by himselfe, that, when they had dyned, they dyd resorte to that place of Cloister and there studyed upon there books, every one in his carrell, all the after nonne, unto evensong tyme. […] All there pewes or carrells was all fynely wainscotted and verie close, all but the forepart which had carved wourke that gave light in at ther carrell doures of wainscott. And in every carrell was a deske to lye there bookes on."
• (by extension) A cubicle or partitioned space for reading or studying, often in a library.
  "He was busy writing his report in a small library carrel."

noun

• (obsolete) A type of fabric used in the 16th and 17th centuries.

noun

• (obsolete) Synonym of quarrel (“a square-headed arrow”).