prime vertical


noun

astronomy the great circle passing through the observer's zenith and meeting the horizon due east and west

QUIZZES

A THANKSGIVING SPELLING QUIZ TO FEED YOUR HISTORY KNOWHOW

Before you celebrate family and blessings this year, take this quiz to test your spelling knowledge of the history and important figures of the first Thanksgiving.
Question 1 of 7

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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012