noun
- plural of umbra; the completely dark inner regions of shadows cast by opaque objects
Usage: astronomy; physics
Examples
- During the solar eclipse, observers in the umbras experienced total darkness.
- The telescope revealed multiple umbras cast by Jupiter’s moons.
- Scientists measured the temperature differences between the umbras and penumbras.
- The umbras created by the buildings provided cool relief from the sun.
- Astronomers study the umbras of sunspots to understand solar activity.
- The umbras moved across the landscape as the eclipse progressed.