Constructed with or strengthened by gabions; having gabions installed as part of the structure or defense.
Past participle of the verb 'to gabion' (to build with gabions), formed regularly with -ed. The base word gabion entered English from French military terminology in the 16th-17th centuries.
Gabioned is a technical adjective that rarely appears outside military history and engineering texts—it's the kind of word that shows how specialized vocabularies develop around specific practices, and then becomes a fossil when those practices change.
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