umbra

A dark area, especially the blackest part of a shadow from which all light is cut off.

The completely dark central portion of the shadow cast by the earth, moon, or other body during an eclipse.

The darkest region of a sunspot.

The only genus of Umbridæ; the mud-minnows. See minnow. 2 , and Umbridæ. There are two species, respectively of Europe and North America, U. krameri and U. limi.

[lowercase] A sciænoid fish, Umbrina cirrosa; the umbrine. See cut under Umbrina.

A shadow or shade.

Among the Romans, one who went to a feast merely at the solicitation of one invited: so called because he followed the guest as a shadow.

In algebra, a symbol which, when paired with another, makes the symbol of a quantity. See umbral notation, under umbral.