עצּמה ‛atstsûmâh ats-tsoo-maw' Feminine of H6099; a bulwark, that is, (figuratively) argumentKJV Usage: strong.
Brown-Driver-Briggs' Hebrew DefinitionsBDB6296 BDB6301 עצּמה 1. defence, argument, strong Origin: from H6099 TWOT: 1674b Parts of Speech: Noun Feminine
עצם עצוּם ‛âtsûm ‛âtsûm aw-tsoom', aw-tsoom' Passive participle of H6105; powerful (specifically a paw); by implication numerousKJV Usage: + feeble, great, mighty, must, strong.