umbral

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

In math, Ono is known for his work on a range of topics across number theory, from Ramanujan’s congruences to the umbral moonshine conjecture.

From The Wall Street Journal • Dec. 4, 2025

The moon will gradually darken as our lunar companion cruises through Earth’s shadow — moving from the penumbral into the umbral phase.

From Washington Post • Oct. 30, 2021

Over the following hour, the moon advances into the umbral shadow.

From Washington Post • Aug. 29, 2015

The string theory underlying umbral moonshine is likely to be “not just any physical theory, but a particularly important one,” Cheng said.

From Scientific American • Apr. 7, 2015

Within the umbral curve the eclipse is annular or total; outside of it and within the penumbral curve the eclipse is partial at the given moment.

From Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 10 "Echinoderma" to "Edward" by Various