τρίστεγονtrístegon, tris'-teg-on; neuter of a compound of G5140 and G4721 as noun; a third roof
(story):—third loft.
Thayer's Greek Lexicon
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STRONGS G5152:
τρίστεγος, τρίστεγον (τρεῖς and στέγη), hating three roofs or stories: Dionysius Halicarnassus 3, 68; (Josephus, b. j. 5, 5, 5); τότρίστεγον, the third story,Acts 20:9 (Genesis 6:16Symm.); ἡτριστεγη, Artemidorus Daldianus, oneir. 4, 46.