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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Plumb n.  A little mass or weight of lead, or the like, attached to a line, and used by builders, etc., to indicate a vertical direction; a plummet; a plumb bob. See Plumb line, below.
 Plumb bob. See Bob, 4.
 Plumb joint, in sheet-metal work, a lap joint, fastened by solder.
 Plumb level. See under Level.
 Plumb line. (a) The cord by which a plumb bob is suspended; a plummet. (b) A line directed to the center of gravity of the earth.
 Plumb rule, a narrow board with a plumb line, used by builders and carpenters.

From: WordNet (r) 2.0

 plumb bob
      n : the metal bob of a plumb line [syn: plumb, plummet]