losa

flagstone, paving stone, slab, tile (flat, rectangular piece of rock or stone)

From Latin lausia, of Celtic origin, from Gaulish or Celtiberian *lausia, from Proto-Celtic *plousā (“stone slab”), of uncertain ultimate origin; possibly from Proto-Indo-European *pleus (“to pluck out”) (cognate with Old Norse flus (“peelings”)), or from Proto-Basque *plausa (“stone slab”).