Source : Webster's Revised Unabridged Dictionary (1913)

Roomful \Room"ful\, a.
   Abounding with room or rooms; roomy. ``A roomful house.''
   [R.] --Donne.

Roomful \Room"ful\, n.; pl. {Roomfuls}.
   As much or many as a room will hold; as, a roomful of men.
   --Swift.

Source : WordNet®

roomful
     n : the quantity a room will hold