Euclid — "And when the lines containing the angle are straight, the angle is called rectil…"
And when the lines containing the angle are straight, the angle is called rectilineal.
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More from Euclid
"Sire, there is no royal road to geometry."
"The greatest of the parts is called the antecedent, and the less the consequent."
"In any triangle, if one of the sides be produced, the exterior angle is equal to the two interior and opposite angles, and the three interior angles of the triangle are equal to two right angles."
"What do I gain by learning these things?"
"A point is that which has no part."