definition of
nub

[1] #1 nub n. [nubble] a small lump or protuberance. wn

[2] #2 nub n. [stub] a small piece; "a nub of coal"; "a stub of a pencil". wn

[3] #3 nub n. [kernel, substance, core, center, centre, essence, gist, heart, heart and soul, inwardness, marrow, meat, pith, sum, nitty-gritty] the choicest or most essential or most vital part of some idea or experience; "the gist of the prosecutor's argument"; "the heart and soul of the Republican Party"; "the nub of the story". wn