Concise Bible Dictionary:
This in Luke 5:19 is supposed by some to refer to the verandah of the open court under which the Lord might be sitting; or it may have been a light roofing accessible by the stairs outside the house, and easily broken through.
Strong’s Dictionary of Greek Words:
Meaning:
probably from the base of 2767 (through the idea of mixing clay and water); earthenware, i.e. a tile (by analogy, a thin roof or awning)