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

Language is a process of free creation; its laws and principles are fixed, but the manner in which the principles of generation are used is free and infinitely varied. Even the interpretation and use of words involves a process of free creation.
Noam Chomsky