Definition: nub

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Source: WordNet (r) 1.7 

nub
     n 1: a small lump or protuberance
     2: a small piece; "a nub of coal" or "a stub of a pencil" [syn:
         stub]
     3: 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" [syn: kernel, substance, core,
         center, essence, gist, heart, heart and soul, inwardness,
         marrow, meat, pith, sum, nitty-gritty]

Source: Webster's Revised Unabridged Dictionary (1913) 

Nub \Nub\, v. t. [Cf. Knob.]
   To push; to nudge; also, to beckon. [Prov. Eng.]
Nub \Nub\, n.
   A jag, or snag; a knob; a protuberance; also, the point or
   gist, as of a story. [Colloq.]