1 (geometry) A polyhedron with parallel ends of the same size and shape, the other faces being parallelogram-shaped sides.  A transparent block in the shape of a prism (typically with triangular ends), used to split or reflect light.
To the Jews, solar eclipses meant that the moon was passing between the sun and the earth, thereby blocking the suns light. Notwithstanding the physical explanation of a solar eclipse, there is also spiritual significance to it: At the time when the sun is eclipsed, it is an unfavorable period for the world. A parable: This can be compared to a human king who made a feast for his subjects, and placed a lantern before them.
A solar eclipse is a special kind of new moon where the Moon blocks out the light of the Sun. A lunar eclipse is a special full moon where the Moon hides in the Earth's shadow for a time. Both kinds of eclipses are like super lunations in effect, triggering extremely transformative energies where they impact you.