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1 definition found
 for Triangular compasses
From The Collaborative International Dictionary of English v.0.48 :

  Triangular \Tri*an"gu*lar\, a. [L. triangularis: cf. F.
     triangulaire.]
     1. Having three angles; having the form of a triangle.
        [1913 Webster]
  
     2. (Bot.) Oblong or elongated, and having three lateral
        angles; as, a triangular seed, leaf, or stem.
        [1913 Webster]
  
     Triangular compasses, compasses with three legs for taking
        off the angular points of a triangle, or any three points
        at the same time.
  
     Triangular crab (Zool.), any maioid crab; -- so called
        because the carapace is usually triangular.
  
     Triangular numbers (Math.), the series of numbers formed by
        the successive sums of the terms of an arithmetical
        progression, of which the first term and the common
        difference are 1. See Figurate numbers, under
        Figurate.
        [1913 Webster]

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