Archaic heraldic or architectural term; may refer to an ornamental treatment or positioning, but the term is rarely used in modern English.
From French 'haut' (high) plus the suffix -ment (manner or quality); origin uncertain in current English usage. Possibly heraldic terminology from medieval French.
This is a word so archaic that even scholars of medieval heraldry struggle to pin down its exact meaning—it's a linguistic ghost, a term that was specific enough to matter once but vague enough now to be nearly forgotten.
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