Ŭm'brā, n.
n. [Lat., O. Sp., & Pr. umbra, It. & Pr. ombra, Fr. ombre, a shade, shadow.]
Sense 1. A shadow.
Sense 2. (Astron.) The conical shadow projected from a planet or satellite, on the side opposite to the sun, and within which a spectator could see no portion of the sun’s disk; — used in contradistinction from penumbra, or the partial shadow within which the sun is seen as only partially hidden from view.