فلك

فَلِكٌ ذ A slave (AA, O) having a buttock like the فَلْكَة [or whirl ] of a spindle (AA, O, K) in shape; (AA, O;) resembling the Zenj; (K;) [for] the buttocks of the Zenj are round: (AA, O:) or large in the buttocks. (TA.) And (O, K) it is said to signify (O) Thick, or coarse of make, in the joints: (O, K:) and loose in the bones; (K;) or weak, loose in the bones, and flaccid; thus expl. by Ibn-'Abbád: (O:) and having a pain in his patella (فِى فَلْكَةِ رُكْبَتِهِ). (O, K.)