Is it ensure, insure, or assure?
"writing room," 1774, from Late Latin scriptorium "place for writing," noun use of neuter of Latin scriptorius "pertaining to writing," from Latin scriptus, past participle of scribere "to write" (see script (n.)).
writing room set aside in monastic communities for the use of scribes engaged in copying manuscripts. Scriptoria were an important feature of the Middle Ages, most characteristically of Benedictine establishments because of St. Benedict's support of literary activities. All who worked in scriptoria, however, were not monks; lay scribes and illuminators from outside the monastic foundation reinforced the clerical scribes.