leap day

noun
February 29: the extra day added to the Gregorian calendar in leap year.

Origin:
1590–1600

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
leap day

noun
the name of the day that is added during a leap year 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
00:10
Leap_day is always a great word to know.
So is bezoar. Does it mean:
a chattering or flighty, light-headed person.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Example sentences
Once every fourth year they add a leap day to this extra period to make it six days.
Every four years a leap day helped keep things on track.
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