urate calculus uric acid calculus. urethral calculus a urinary calculus in the urethra; symptoms vary according to the patient's sex and the site of lodgment. uric acid calculus a hard, yellow or reddish-yellow urinary calculus formed from uric acid.
In some traditions, the first day of Christmas begins on the evening of December 25th with the following day considered the First Day of Christmas (December 26th). In these traditions, the twelve days begin December 26 and include Epiphany on January 6. The origin and counting of the Twelve Days is complicated, and is related to differences in calendars, church traditions, and ways to observe this holy day in various cultures (see Christmas).
U.S. Christmas Season - Statistics & Facts Christmas is celebrated in the United States on the 25th of December. Christmas is a civil holiday and is celebrated by an increasing number of non-Christians, and is an integral part of the holiday season.