either of two periods of partial darkness, after sunset or before sunrise, when the center of the sun is more than 6° but less than 18° below the horizon.
Five English Words That Are Utterly Unique
Read more in this article about some frequently asked questions and fun facts related to our definitions.
A Word Problem in Tonight’s Meteor Shower
Tonight’s meteor shower has an anachronistic name. It was originally named after the constellation Quadrans Muralis, discovered by Jerome Lalande in 1795. Well, “discover” may be the wrong word. Today, the International Astronomical Union no longer recognizes this constellation, rather the stars that were a part of it are now considered to be parts of other, more widely recognized constellations. Lalande named the constellation “Quadrans Muralis” after …
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019