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bissextile

[ bahy-seks-til, -tahyl, bih- ]
/ baɪˈsɛks tɪl, -taɪl, bɪ- /
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adjective

containing or noting the extra day of leap year: The years 1980 and 1984 were both bissextile.

noun

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Origin of bissextile

1585–95; <Late Latin bi(s)sextilis (annus) leap year, equivalent to bissext(us) bissextus + -ilis-ile
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British Dictionary definitions for bissextile

bissextile
/ (bɪˈsɛkstaɪl) /

adjective

(of a month or year) containing the extra day of a leap year

noun

a rare name for leap year

Word Origin for bissextile

C16: from Late Latin bissextilis annus leap year, from Latin bissextus, from bi- 1 + sextus sixth; referring to February 24, the 6th day before the Calends of March
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
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