umbra

The dark shadow of the moon, earth, or any other planet.

umbra
umbra, ae, f. [etym. dub.; Curt. compares Sanscr. ambara, an encircling], a shade, shadow. I Lit.: ...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
umbra
umbra ae, f a shade, shadow: terrae: colles . . . adferunt umbram vallibus: noctis se condidit umbr...

An Elementary Latin Dictionary
Umbra
·noun The central dark portion, or nucleus, of a sun spot. II. Umbra ·noun The fainter part of a su...

Webster's Dictionary of the English Language