n 1 a  :  the boundary of a closed plane figure  b  :  the length of a perimeter  2  :  an instrument for examining the discriminative powers of different parts of the retina often consisting of an adjustable semicircular arm with a fixation point for the eye and variable stations for the visual stimuli .
 
 
 
Similar sounding terms:  hy·per·me·tria  pe·rim·e·try   premature  pre·mo·tor 
 
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