Femerell n. : A lantern, or louver covering, placed on a roof, for ventilation or escape of smoke.

Example:


Taxonomy
femerell, roof, chimney, ventilation, Fume, louver, Fem, ell, lantern, smoke, Dictionary, Dictionary of Architecture and Construction, Unanswered questions, Webster 1913, escape, Search, ventilator, louvered.

Defination from the web:
... Architecture: femerell. Top. Home > Library > Home & Garden > Architecture and Construction ...