half-ray

1 definition found

half-ray - 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]