1. The dark cone of shadow projected from a planet or satellite on the side opposite to the sun; the dark centre of a sun-spot.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• umbrela,
• numbre,
• embrak,
• embro,
• embras,
• umbrace,
• numbr,
• imora,
• ambea,
• amera,
• umbrlla,
• nmbr,
• unbra,
• alumbra,
• umnra,
• umra,
• cumbria,
• lumbr,
• umber,
• imbru

• umbrella,
• umbria,
• umber,
• umbrage,
• umpirage,
• umbrina,
• Umbrell,
• umbrian.

The adjective form of the word "umbra" is "umbral".

The plural of the "umbra" can be the "umbras".

The singular of the "umbra" can be the "umbra".