Important derivatives are: comb,unkempt,gem; Tooth, nail.; Suffixed o-grade form*gombh-o- .; Suffixed zero-grade form*g?bh-?n- . oakum , from Old English 3-cumba , oakum.; chime 2 , from Old English cim- , cimb- , rim (only in compounds), from Germanic *kimb- , perhaps from gembh- .; Possibly suffixed form*gembh-m3 . gem , gemma , gemmate , gemmule , from Latin gemma , bud, hence gem.; 語源; Pokornyaembh- 369.