Meaning of PLUMB LINE

Pronunciation:			plum lIn
WordNet Dictionary
	Definition:		[n]  a cord from which a metal weight is suspended pointing directly to the earth's center of gravity; used to determine the vertical from a given point
	Websites:
	Synonyms:		perpendicular
	See Also:		cord, lead line, plumb, plumb bob, plumb rule, plummet, sounding line