1. of or relating to a shadow or shade
Usage: formal; literary
2. of or relating to an umbra, especially the complete shadow cast during an eclipse
Usage: astronomy

Examples

• The umbral darkness enveloped the forest floor.
• During the solar eclipse, observers in the umbral zone experienced total darkness.
• The poet described the umbral quality of twilight.
• Scientists studied the umbral shadow cast by the moon.
• The umbral region of the eclipse path was narrow but spectacular.
• Ancient cultures feared the umbral phase of lunar eclipses.