Penumbral

[pi-nuhm-bruh] /pɪˈnʌm brə/

noun, plural penumbrae
[pi-nuhm-bree] /pɪˈnʌm bri/ (Show IPA), penumbras.
1.
Astronomy.

2.
a shadowy, indefinite, or marginal area.
/pɪˈnʌmbrə/
noun (pl) -brae (-briː), -bras
1.
a fringe region of half shadow resulting from the partial obstruction of light by an opaque object
2.
(astronomy) the lighter and outer region of a sunspot
3.
(painting) the point or area in which light and shade blend
n.

1660s, from Modern Latin penumbra “partial shadow outside the complete shadow of an eclipse,” coined 1604 by Kepler from Latin pæne “almost” + umbra “shadow” (see umbrage). Related: Penumbral.
penumbra
(pĭ-nŭm’brə)
Plural penumbras or penumbrae (pĭ-nŭm’brē)

Read Also:

Penurious
[puh-noo r-ee-uh s, -nyoo r-] /pəˈnʊər i əs, -ˈnyʊər-/ adjective 1. extremely stingy; parsimonious; miserly. 2. extremely poor; destitute; indigent. 3. poorly or inadequately supplied; lacking in means or resources. /pɪˈnjʊərɪəs/ adjective 1. niggardly with money 2. lacking money or means 3. yielding little; scanty adj. 1590s, from penury + -ous, or else from Medieval […]
Penury
[pen-yuh-ree] /ˈpɛn yə ri/ noun 1. extreme poverty; destitution. 2. scarcity; dearth; inadequacy; insufficiency. /ˈpɛnjʊrɪ/ noun 1. extreme poverty 2. extreme scarcity n. c.1400, from Latin penuria “want, need; scarcity,” related to paene “scarcely.”
Penutian
[puh-noo-tee-uh n, -shuh n] /pəˈnu ti ən, -ʃən/ noun 1. a group of American Indian language families of central and coastal California, including Wintu, Maidu, Yokuts, Miwok, and Costanoan, thought to be descendants of a single protolanguage spoken at a remote period. 2. any of several other hypothesized genetic groupings of languages that include these […]

Penza
[pen-zuh; Russian pyen-zuh] /ˈpɛn zə; Russian ˈpyɛn zə/ noun 1. a city in the W Russian Federation in Europe. /Russian ˈpjɛnzə/ noun 1. a city in W Russia: manufacturing centre. Pop: 514 000 (2005 est)
Penzance
[pen-zans] /pɛnˈzæns/ noun 1. a seaport in SW Cornwall, in the SW extremity of England: resort. /pɛnˈzæns/ noun 1. a town in SW England, in SW Cornwall: the westernmost town in England; resort and fishing port. Pop: 20 255 (2001) place in Cornwall, Pensans (late 13c.), literally “Holy Headland,” from Cornish penn “head” + sans […]