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Woordstudie
Brown-Driver-Briggs Abridged Hebrew Lexicon
[קְטַר] n.m. joint, knot
Strong Concise Dictionary Of The Words In The Hebrew Bible
H7001קְטַרqᵉṭar; (Aramaic) from a root corresponding to 7000; a knot (as tied up), i.e. (figuratively) a riddle; also a vertebra (as if a knot) — doubt, joint.