H7001 קְטַר (ket-ar')

KJV renderings: doubt, joint.
Strong's definition: a knot (as tied up), i.e. (figuratively) a riddle; also a vertebra (as if a knot)
Derivation: (Aramaic) from a root corresponding to H7000 (קָטַר);

From James Strong's public-domain dictionaries (H), JSON edition by OpenScriptures (CC-BY-SA). Every dotted-underline word in the text links here.