1535, "the mind in its primary state," from L., lit. "scraped tablet," from which writing has been erased, thus ready to be written on again, from tabula (see table) + rasa, fem. pp. of radere "to scrape away, erase" (see raze). A loan-translation
of Aristotle's pinakis agraphos, lit. "unwritten tablet" ("De anima," 7.22).