hrof

Cognate with Old Frisian hrōf, Old Saxon rōf, Dutch roef (“cabin, coffin-lid”), Old Norse hróf (“boat-shed”).

hrōf m

roof
- Homilies of the Anglo-Saxon Church
  Eft hē ontende sum hǣðen templ: þā ġewende sē līġ, ðurh þǣs windes blǣd, tō sumes mannes hūse, ðe þǣr ġehende stōd; ac Martinus āstāh on ðām stiċelan hrōfe, and sette hine sylfne onġēan ðām sweġendum līġe, and hē sōna ðrēow ðwyres wið þǣs windes
  Afterwards he set fire to a heathen temple; then through the blowing of the wind, the fire turned to a man's house that stood nearby; but Martinus climbed on the steep roof and set himself against the roaring fire, and he immediately turned it the opposite direction of the wind
(poetic) the sky or heavens

Strong a-stem:

More information singular, plural ...

Old English