roomful

room +‎ -ful

roomful (plural roomfuls or roomsful)

1. The amount that a room can hold, especially the number of people that can fit into a room.
   • 1974, Artforum, volume 13, numbers 4-10, page 35:

     Bengston doing a roomful of painting is like Joe Willie Namath doing a gameful of curl patterns, Jason Robards doing an eveningful of O'Neill, Tina Turner doing a concertful of. . . . and so on.

2. The people in a room, considered as a group.

room +‎ -ful

roomful (comparative more roomful, superlative most roomful)

1. Abounding with room or rooms; roomy.
   • 1612, John Donne, Of the Progress of the Soul—The Second Anniversery:

     A roomful house.