Dico+

nom

1 : one of the crosspieces that form the steps of a ladder

2 : (mathematics) a straight line extending from a point

3 : a straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere)

4 : a group of nearly parallel lines of electromagnetic radiation

5 : the length of a line segment between the center and circumference of a circle or sphere

6 : a column of light (as from a beacon)

Definitions