GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Quadrat , n. [F. quadrat, cadrat. See Quadrate.]
   (Print.) A block of type metal lower than the letters, -- used in spacing and in blank lines. [Abbrev. quad.]
   1913 Webster
   An old instrument used for taking altitudes; -- called also geometrical square, and line of shadows.
   1913 Webster