Ma'anar ƙamus na kalmar "nub" ƙarami ne kuma muhimmin sashi ko batu na wani abu. Hakanan yana iya komawa zuwa ƙaramar dunƙule ko haɓakawa, kamar ƙwanƙolin da ke ƙarshen fensir ko kurtun reshe. Bugu da ƙari, ana iya amfani da "nub" ba bisa ƙa'ida ba don nufin tsakiya ko mafi mahimmancin ɓangaren wani abu, kamar jigon gardama ko nub of a problem.
