half-ray
Half"-ray`, n. (Geom.) Defn: 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.
Half"-ray`, n. (Geom.) Defn: 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.