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).