Joint

"a joining, joint" (akin to harmozo, "to fit, join"), is found in Heb 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."

"a ligature, joint" (akin to hapto, "to fit, to fasten"), occurs in Eph 4:16, Col 2:19.