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
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
The first partial eclipse phase starts at 1:58 a.m., when the moon enters Earth’s umbral shadow.
From Washington Post ● Mar. 29, 2014
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
