A hapax whose alternative interpretation is ‘one having defective eyebrow’; though in most Hebrew dictionaries this word is interpreted as ‘humpbacked’, the context of Lv 21: 20 rather suggests a defect in the eye area.
The root is likely related to *ganb- ‘side and back of torso’ (SED I No. 85).
Though traditionally identified with Sem. *gbb ‘to be bent’ ([CDG 177], [DRS
94]), the present root is rather influenced by, than related to, the latter.