Definition of lum in English:

lum

Line breaks: lum

Entry from British & World English dictionary

noun

Scottish & Northern English
A chimney.

Origin

early 16th century: perhaps from Old French lum 'light', from Latin lumen.

Definition of lum in:

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Word of the day demoralize
Pronunciation: dəˈmôrəˌlīz
verb
cause (someone) to lose confidence or hope; dispirit