Definitions for half-ray
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Webster Dictionary
Half-ray(noun)
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
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"half-ray." Definitions.net. STANDS4 LLC, 2013. Web. 19 May 2013. <http://www.definitions.net/definition/half-ray>.

