The Collaborative International Dictionary of English v.0.48:

Nob \Nob\, n. [Cf. Knob.]
   The head. [Low]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Nob \Nob\, n. [Abbrev. fr. noble.]
   A person in a superior position in life; a nobleman. [Slang]
   [1913 Webster]

WordNet (r) 3.0 (2006):

nob
    n 1: informal term for an upper-class or wealthy person [syn:
         toff, nob]

Easton's 1897 Bible Dictionary:

Nob
   high place, a city of the priests, first mentioned in the
   history of David's wanderings (1 Sam. 21:1). Here the tabernacle
   was then standing, and here Ahimelech the priest resided. (See AHIMELECH.) From Isa. 10:28-32 it seems to have been
   near Jerusalem. It has been identified by some with el-Isawiyeh,
   one mile and a half to the north-east of Jerusalem. But
   according to Isa. 10:28-32 it was on the south of Geba, on the
   road to Jerusalem, and within sight of the city. This
   identification does not meet these conditions, and hence others
   (as Dean Stanley) think that it was the northern summit of Mount
   Olivet, the place where David "worshipped God" when fleeing from
   Absalom (2 Sam. 15:32), or more probably (Conder) that it was
   the same as Mizpeh (q.v.), Judg. 20:1; Josh. 18:26; 1 Sam. 7:16,
   at Nebi Samwil, about 5 miles north-west of Jerusalem.

     After being supplied with the sacred loaves of showbread, and
   girding on the sword of Goliath, which was brought forth from
   behind the ephod, David fled from Nob and sought refuge at the
   court of Achish, the king of Gath, where he was cast into
   prison. (Comp. titles of Ps. 34 and 56.)


Hitchcock's Bible Names Dictionary (late 1800's):

Nob, discourse; prophecy