plumb line

Noun
  1. 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 (synset 103975985)
    is a type of: cord - a line made of twisted fibers or threads
    subtypes:
    has: plumb, plumb bob, plummet - the metal bob of a plumb line
    same as: perpendicular

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