muelos denotes bodily marrow, named in the verse's image of penetration to joints and marrow.

The attested use names bodily marrow in the paired expression “of joints and marrows,” within the verse's image of penetrating division.

1. Bodily marrow in a joints-and-marrow pairing · dominant

   In Hebrews 4:12, the genitive plural form occurs in the paired phrase concerning joints and marrow as the verse describes penetration and division. The APB renders the clause “of joints and marrows,” locating the term in a bodily comparison.

   Hebrews 4:12

In the Anselm Project Bible: In Hebrews 4:12, the APB presents the term within “of joints and marrows.” This wording confirms the clause's bodily imagery rather than isolating a precise English equivalent.