From The Collaborative International Dictionary of English v.0.48 [gcide]:
Plumb \Plumb\ (pl[u^]m), n. [F. plomb, L. plumbum lead, a leaden
ball or bullet; cf. Gr. mo`lybos, mo`libos, mo`lybdos. Cf.
{Plummet}, {Plunge}.]
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.
[1913 Webster]
{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.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
plumb bob
n 1: the metal bob of a plumb line [syn: {plumb bob}, {plumb},
{plummet}]
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