Similar words: snub, nubile, connubial. Meaning: [nʌb] 
n. 1. a small lump or protuberance 2. a small piece 3. the choicest or most essential or most vital part of some idea or experience.
n. 1. a small lump or protuberance 2. a small piece 3. the choicest or most essential or most vital part of some idea or experience. 
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31. The nub of the problem is that you cannot have a consistent "arrow of time" in the presence of closed timelike curves.
32. The clitoris has a glans as well: the exquisitely sensitive nub that is, without question, the crown jewel of the clitoral system.
33. Results Transrectal color Doppler ultrasonography showed the change and size of minor lesions such as prostate hyperplasia nub and seminal vesiculitis.