oakumn.[AS. cumba; pref. - (cf. G. er-, Goth. us-, orig. meaning, out) + cemban to comb, camb comb. See Comb.]1. The material obtained by untwisting and picking into loose fiber old hemp ropes; -- used for calking the seams of ships, stopping leaks, etc.()2. The coarse portion separated from flax or hemp in nackling.(Knight.)White oakum, that made from untarred rope.()