An obsolete spelling or variant of 'furthermore,' meaning 'moreover' or 'in addition.'
Old English combination of 'further' and 'more,' with spelling variations reflecting different dialects and time periods. This variant represents pre-standardization English.
Futhermore is a ghost word—it appeared in a few old texts and dictionaries picked it up, but it was never really standard English, showing how careful scholars have to be about which variants are 'real' versus typos.
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