-ώροφος

Etymology
Learnedly, from. The noun as second combining form, with vowel change according to Wackernagel's law "lengthening in composition" (here, from brachy, short omicron ⟨ο⟩ to macron, long omega ⟨ω⟩).

Suffix

 * 1)   as second combining form of adjectives or nouns denoting the number of floors or their characteristics

Declension
As a noun:

As an adjective: