Webster's English Dictionary

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arrowhead

ar.row.head \'ar-o--.hed, 'ar-*-\ n 1: the usu. separate wedge-shaped 
   striking end of an arrow  2: something resembling an arrowhead; specif : a 
   wedge-shaped mark  on a drawing to limit a dimension line 3: any of a genus 
   (Sagittaria) of plants of the water-plantain family  with leaves shaped 
   like arrowheads