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

Yet the person I read about in my recovery diary is childlike and prosaic, unlike that umbral pre-hospital self who could, even at her most obscured, be eerily illuminating.

From The Guardian • Jan. 13, 2013

Outside the umbral cone is that of the penumbra, within which the sun is partially hidden by the moon.

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