The professor drew diagrams on the blackboard to elucidate his point to the class.

It is a verb which means to explain to make clear or understood.

He elucidated the matter before starting the project. Elucidate means to make something clear.

When Jennifer asked her boss for more details, he declined to elucidate further.

The professor used a detailed diagram to elucidate the complex concept in her lecture.

To make clear or manifest; to render more intelligible; to illustrate; as, an example will elucidate the subject.