~ Wordy Wordsmith Sez:

Umbra

Definition:
um·bra Pronunciation Key
noun
(Latin) Shade; shadow.

astronomy

a ) The conical shadow profected from a planet or satellite, and the side opposite the sun, whithin which a spectator could see no portion of the sun's disk.

b ) The complete or perfect shadow of an opaque body, as a planet, where the direct light from the source of illumination is wholly cut off.

c ) The dark central dark portion, or nucleus, of a sunspot

.
d) A complete shadow, within which no light is received from a given source.

e) Ghost.