Penumbra vs. Umbra

Penumbranoun

A partially shaded area around the edges of a shadow, especially an eclipse.

Penumbranoun

(astronomy) A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.

Penumbranoun

(figuratively) An area of uncertainty or intermediacy between two mutually exclusive states or categories.

Penumbranoun

(figuratively) An area that lies on the edge of something; a fringe.

Penumbranoun

Something related to, connected to, and implied by, the existence of something else that is necessary for the second thing to be full and complete in its essential aspects.

Penumbranoun

(medicine) (in "ischaemic penumbra", after a stroke) A region of the brain that has lost only some of its blood supply, and retains structural integrity but has lost function.

Penumbranoun

An incomplete or partial shadow.

Penumbranoun

The shadow cast, in an eclipse, where the light is partly, but not wholly, cut off by the intervening body; the space of partial illumination between the umbra, or perfect shadow, on all sides, and the full light.

Penumbranoun

The part of a picture where the shade imperceptibly blends with the light.

Penumbranoun

a fringe region of partial shadow around an umbra

Umbranoun

The fully shaded inner region of a shadow cast by an opaque object.

Umbranoun

(astronomy) The area on the earth or moon experiencing the total phase of an eclipse.

Umbranoun

(astronomy) The central region of a sunspot.

Umbranoun

A shadow.

Umbranoun

(archaic) An uninvited guest brought along by one who was invited.

Umbranoun

The conical shadow projected from a planet or satellite, on the side opposite to the sun, within which a spectator could see no portion of the sun's disk; - used in contradistinction from penumbra. See Penumbra.

Umbranoun

Any one of several species of sciænoid food fishes of the genus Umbrina, especially the Mediterranean species (Umbrina cirrhosa), which is highly esteemed as a market fish; - called also ombre, and umbrine.

Umbranoun

a region of complete shadow resulting from total obstruction of light