D defs.my
Entry 1 sense Webster, 1913

Sofa

/sō'fə/ · So·fa · IPA /ˈsoʊfə/
01 n. A long seat, usually with a cushioned bottom, back, and ends; -- much used as a comfortable piece of furniture.
pl. Sofas ((#))
  1. 1.
    A long seat, usually with a cushioned bottom, back, and ends; -- much used as a comfortable piece of furniture.
    “Let fall the curtains, wheel the sofa round.” Cowper.
Phrases & compounds
Sofa bed — a sofa so contrived that it may be extended to form a bed; -- called also sofa bedstead.