from an unused root meaning to set a period (compare H5710, H5749); the menstrual flux (as periodical); by implication (in plural) soiling; filthy.
Usages throughout the bible
Isaiah 64:6
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But we are all as an unclean thing, and all our righteousnesses are as filthy H5708 rags; and we all do fade as a leaf; and our iniquities, like the wind, have taken us away.