Bissextile
containing or noting the extra day of leap year:
The years 1980 and 1984 were both bissextile.
leap year.
Historical Examples
The Geography of Strabo, Volume III (of 3) Strabo
Letters on Astronomy Denison Olmsted
Ancient America, in Notes on American Archaeology John D. Baldwin
Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 Various
adjective
(of a month or year) containing the extra day of a leap year
noun
a rare name for leap year
Read Also:
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