Joint - Vine's Expository Dictionary of New Testament Words
Joint[ 1,,G719, harmos ]
a joining, joint" (akin to harmozo, "to fit, join"), is found in Hebrews 4:12, figuratively (with the word "marrow") of the inward moral and spiritual being of man, as just previously expressed literally in the phrase "soul and spirit."
[ 2,,G860, haphe ]
"a ligature, joint" (akin to hapto, "to fit, to fasten"), occurs in Ephesians 4:16; Colossians 2:19.