Definitions

1. noun

the sun as a star, especially in relation to its effects on the Earth or on other stars; a sun or star that is considered to be a source of light and heat.

“The helion of the solar system is the primary source of energy for all the planets.”

2. noun

a star that is considered to be a source of light and heat.

“The astronomer studied the helion of a distant galaxy to better understand its properties.”

3. noun

a bright spot or patch in a cloud, especially one that is caused by the sun shining through the cloud.

“The helion in the cloud was a beautiful sight to behold.”