כפ
'kep' appears to be a somewhat generalized term indicating a concave shape, essentially a socket. It appears in a few mechanical and engineering contexts, often in conjunction with the tabernacle and its components, as well as many physiological uses such as “the palm of the hand”, “the ball of the foot” and “the socket of the hip”.
Oddly, the word aden is also translated as “socket”
Usage examples:
Genesis 8:9 - but no found the dove resting place for the sole of her foot and she returned to him into the ark
Genesis 20:5 - did not he say my sister she [is] and she even herself said my brother He [is] in the integrity of my heart and innocence of my hands have I done this
Genesis 31:42 - Unless the God of my father the God of Abraham and the fear of Isaac had been surely now empty-handed you would have sent me away - my affliction and the labor of my hands has seen God and He rendered judgment last night
Genesis 32:25 - And when He saw that not He did prevail then He touched the socket of his hip and was out of joint the socket of the hip of Jacob as He wrestled with him
Genesis 32:32 - Upon thus not do eat the sons of Israel - the sinew the tendon which [is] on the hip socket of the thigh to day this because He touched the socket of hip of Jacob in the sinew the tendon
Genesis 40:11 - And the cup of Pharaoh [was] in my hand and I took - the grapes and pressed them into cup of Pharaoh and placed - the cup in hand of Pharaoh
Genesis40:21 - And he restored again - chief the cupbearer to his cupbearership and he placed the cup in hand of Pharaoh
LexID 3709