Or mtsurah {mets-oo-raw'}; feminine of matsowr; a hemming in, i.e. (objectively) a mound (of siege), or (subjectively) a rampart (of protection), (abstractly) fortification -- fenced (city, fort, munition, strong hold.
see HEBREW matsowr
H4694. metsurah
מְצוּרָה noun feminine siege-works, rampart; — absolute ׳מ Nahum 2:2; 2 Chronicles 14:5; plural מְצוּרוֺת11:11 +, מְצֻרֹת Isaiah 29:3, etc.; —
1 siege-works Isaiah 29:3.
2 rampart מ ׳נָצוֺר Nahum 2:2 guard the rampart / ("" דֶרֶךְ צַמֵּה; We Now derive from נצר, i.e. keep watch !), 2 Chronicles 11:11, מְצוּרָה עָרֵי14:5 fortified cities, so (הַ)מְצוּרוֺת עָרַי v.14:10; 2 Chronicles 14:23; 12:4; 21:3.