Half-ray
Related to Half-ray: half line
Half´-ray`
(~rā`)n. | 1. | (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. |
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.