Origin of penumbra
OTHER WORDS FROM penumbrape·num·bral, pe·num·brous, adjective
How to use penumbra in a sentence
The penumbral line is marked from hour to hour on the maps given annually in the American Ephemeris.
I think the intellect, when focussed so as to give definition without penumbral haze, is sure to realise this image at the last.Fragments of science, V. 1-2|John Tyndall
Strange, penumbral, characters roam the boardrooms of banks in the countries in transition.After the Rain|Sam Vaknin
Isabel snuck into the guest bedroom and settled into an overstuffed armchair at a penumbral corner.The Capgras Shift|Sam Vaknin
It may be that all the elements of the penumbral cone intersect the earth.