A small shaft or duct designed to allow smoke or fumes to pass through or escape.
From Old French 'fumerel' (diminutive of fumer), referring to a small opening or channel, combining Latin 'fumus' with the diminutive suffix '-el' to indicate smallness.
Medieval castles and fortifications used fumerels in their chimneys and defensive structures—this specialized architectural term reminds us that smoke management was once a serious engineering challenge.
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