bissextile

a. 闰的
n. 闰年

bis.sex.tile

adj.（形容词）
Of or relating to a leap year.
闰年的：闰年的与闰年有关的
Of or relating to the extra day falling in a leap year.
闰年中增加的天数的：在一闰年中所增加天数的或与在闰年中增加的天数有关的
n.（名词）
A leap year.
闰年

来源：
Late Latin bissextilis [containing an intercalary day]
后期拉丁语 bissextilis [含有闰日的]
from Latin bissextus [an intercalary day]
源自 拉丁语 bissextus [闰日]
bi- [twice] * see bi-
bi- [两次] *参见 bi-
sextus [sixth, because the sixth day before the Calends of March (February 24) occurred twice every leap year] * see sext
sextus [第六，因为古罗马历三月初一（二月24日）往前推的第六天每一闰年出现两次] *参见 sext