资料来源 : pyDict

屋顶排气口; 屋顶天窗

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Femerell \Fem"er*ell\, n. [OF. fumeraille part of a chimney. See
   {Fume}.] (Arch.)
   A lantern, or louver covering, placed on a roof, for
   ventilation or escape of smoke.