A ray is a line that has an originating point, but no end.
Yes it is
In mathematics, a ray is a well-defined concept. A ray has one endpoint and extends indefinitely in one direction. So, a ray is not considered an undefined term in mathematics.
In mathematics, a ray is defined as a part of a line that has one endpoint and extends indefinitely in one direction. It is represented by a single point and an arrow indicating the direction of the line.
It is a ray [of coherent light], a physical term.
A ray is not an undefined term.
sile
Biome
You just defined a ray. ■
The term conserve can be defined as protecting from loss. It can also be defined as using something sparingly or being careful with something. Conserving energy for later use is an example using the term.
The U.S. Supreme Court has defined the term "search" to occur when
Matter
The term is cetology.