Astronomy. of, causing, or being the partial shadow outside the complete shadow of an opaque body, such as a planet, where the light from the source of illumination is only partly cut off:Four consecutive total lunar eclipses in a row, without any penumbral eclipses in between, are known as a tetrad.Compare umbral 2a. relating to or being the grayish marginal portion of a sunspot:An average eye can see a sunspot with a penumbral diameter of at least 41 arcseconds.Compare umbral 2b.
relating to or being a shadowy, indefinite, or marginal area:The apple trees provide penumbral lighting that is perfect for studying, thinking, or even a nap.While the beneficiaries of corruption fête themselves with cocktail nights and caviar dreams, its victims wander a penumbral existence.
U.S. Law. of or relating to the set of rights implicit in the U.S. Constitution or Bill of Rights:The wealthy, like everyone else, are entitled to the full enjoyment of the Constitution's express and penumbral guarantees.
更多penumbral例句
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.
Strange, penumbral, characters roam the boardrooms of banks in the countries in transition.
Isabel snuck into the guest bedroom and settled into an overstuffed armchair at a penumbral corner.
It may be that all the elements of the penumbral cone intersect the earth.