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Definition of Penumbral
1. Adjective. Of or pertaining to the region of partial shadow around an umbra.
Definition of Penumbral
1. Adjective. Of, or pertaining to, the penumbra. ¹
¹ Source: wiktionary.com
Definition of Penumbral
1. [adj]
Lexicographical Neighbors of Penumbral
Literary usage of Penumbral
Below you will find example usage of this term as found in modern and/or classical literature:
1. Roentgen Rays and Phenomena of the Anode and Cathode: Principles by Edward Pruden Thompson, William Arnold Anthony (1896)
"B. In the diagram Sj S2, the edges of the penumbral shadow are very sharp and
distinct. The direction of the rays is indicated, showing that there was ..."
2. The Mathematical Questions, Proposed in the Ladies' Diary, and Their by Thomas Leybourn (1817)
"... the latitude and declination corrected to the reduced time, the time when the
penumbral shadow would equal the superficie of the globe 10" ..."
3. Text-book of Popular Astronomy by William Guy Peck (1883)
"Because the element of the penumbral cone that determines the place of ...
As the shadow system sweeps eastward, other elements of the penumbral cone become ..."
Other Resources:
