Definitions from Wiktionary (umbra)

▸ noun:  The fully shaded inner region of a shadow cast by an opaque object.
▸ noun:  (astronomy) The area on the earth or moon experiencing the total phase of an eclipse.
▸ noun:  (astronomy) The central region of a sunspot.
▸ noun:  (chiefly literary) A shadow.
▸ noun:  (archaic) An uninvited guest brought along by one who was invited.
▸ noun:  One of the family Umbridae of mudminnows.
▸ noun:  One of genus Umbrina of drums (family Sciaenidae).
▸ noun:  (mathematics) An element of the umbral calculus.
▸ Also see umbra


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