Definition of Penumbral

1. Adjective. Of or pertaining to the region of partial shadow around an umbra.

Partainyms: Penumbra



Definition of Penumbral

1. Adjective. Of, or pertaining to, the penumbra. ¹

¹ Source: wiktionary.com

Definition of Penumbral

1. [adj]

Penumbral Pictures

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Lexicographical Neighbors of Penumbral

penuchis
penuchle
penuchles
penuckle
penuckles
penult
penultima
penultima law
penultimas
penultimate
penultimately
penultimates
penults
penumbra
penumbrae
penumbral (current term)
penumbras
penumbrous
penup
penups
penuries
penurious
penuriously
penuriousness
penuriousnesses
penurities
penurity
penury
penwiper
penwipers

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 ..."

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