palimpsest (n.)

"parchment from which earlier writing has been removed to clear it for new writing," 1660s, from Latin palimpsestus, from Greek palimpsestos "scraped again," from palin "again, back" (from PIE *kwle-i-, suffixed form of root *kwel- (1) "revolve, move round'" PIE *kw- becomes Greek p- before some vowels) + verbal adjective of psen "to rub smooth," which is of uncertain origin.

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