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Meaning of plotting board

plot'ting board"

Pronunciation: [key]
  1. a transparent table on a ship, used as a plotting sheet.
  2. a device based on a map or other scale representation of a region against which artillery fire is to be directed, for use in directing artillery fire against a fixed or moving target.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.