[ἁρμός] from the same as G716; an articulation (of the body)
Usages throughout the bible
Hebrews 4:12
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For the word of God is quick, and powerful, and sharper than any twoedged sword, piercing even to the dividing asunder of soul and spirit, and of the joints G719 and marrow, and is a discerner of the thoughts and intents of the heart.