QUADRAT

quadrat. Quadrat, n. an instrument called geometrical square

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