Thayer's Greek Lexicon

 1. clay, potter's earth
2. anything made of clay, earthen ware
3. a roofing tile
  1) the roof itself
  2) the phrase "through the roof", means through the door in the
roof to which a ladder or stairway led up from the street
(according to the Rabbis distinguish two ways of entering a
house, "the way through the door" and "the way through the
roof"

For Synonyms see entry G5858