subs. (Winchester College).Clean sheets. [Before 1540 the beds were bundles of straw on a stone floor. At that date Dean Fleshmonger put in oaken floors, and provided proper beds, such as existed in 1871 in Third, and later in the case of the Præfect of Halls unused beds in Sixth. The term has never been used, as stated by Barrère, in reference to mattresses of any kind, straw or other.]