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1 definition found
 for Half-ray
From The Collaborative International Dictionary of English v.0.48 :

  Half-ray \Half"-ray`\ (-r[=a]`), n. (Geom.)
     A straight line considered as drawn from a center to an
     indefinite distance in one direction, the complete ray being
     the whole line drawn to an indefinite distance in both
     directions.
     [1913 Webster]

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