Associations to the word «Umbra»

Wiktionary

UMBRA, noun. A shadow.
UMBRA, noun. (astronomy) The central region of a sunspot.
UMBRA RECTA, noun. On a shadow in the shape of a right triangle, the length of the shadow's edge adjacent to a measured angle.
UMBRA VERSA, noun. On a shadow in the shape of a right triangle, the length of the shadow's edge opposite to a measured angle.

Dictionary definition

UMBRA, noun. A region of complete shadow resulting from total obstruction of light.

Wise words

When ideas fail, words come in very handy.
Johann Wolfgang von Goethe