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Webster 1913 Edition

Noun.

[OF.

fumeraille

part of a chimney. See

(Arch.)

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

femerell ‎(plural femerells)

(archaic) The lantern, louvre, or covering placed in the ridge of a hall roof for the purpose of ventilation or letting out the smoke of the fire kindled on a central hearth.