1.bissextile day - the name of the day that is added during a leap yearFebruary 29, leap dayday - a day assigned to a particular purpose or observance; "Mother's Day"Feb, February - the month following January and preceding March
bissextile day
noun
Synonyms for bissextile day
noun the name of the day that is added during a leap year
bissextile day - the name of the day that is added during a leap year