Dictionary of the Scots Language
DSL - SND1 QUAIR, n. Also quar(e), quer. Sc. forms of Eng. quire. [kwe:r] 1. As in Eng., a set of twenty-four sheets of writing paper (Sc. 1818 Sawers). Comb. quair-book, a book consisting of a single quire of paper so folded as to make 16 pages, a kind of exercise book.
*Sc. 1700 Domestic Details Sir D. Hume (1843) 69:
A book of 3 or 4 quares of paper.
[...]2. By extension: any literary work, orig. one that might occupy a quire of paper, a book or piece of writing of any length. Now only liter. and prob. as a reminiscence of The Kingis Quair of James I. c.1423.
*Sc. 1952 Scots Mag. (Jan.) 270:
There’s some that tae their ingle cast Their e’en, an’ wi’ some learned quair, Tak’ tent tae pree their leisure tame.
*Sc. 1958 K. Wittig Sc. Tradition 330:
In his trilogy A Scots Quair [1932–4] J. Leslie Mitchell produced the most ambitious single effort in Scottish fiction.
[O.Sc. quair, c.1470, E.M.E. cwaer, quaer, book, O.Fr. qua(i)er, quire, a copy-book, Mod. Fr. cahier, an exercise-book, Lat. quaterni, a set of four.]