二日

Etymology 1
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From. First attested in the  of 720.

Analyzable as a compound of.

Noun

 * 1)  two days, a two-day period
 * 2)  the second day after some set point in time
 * 3)  the second day of the month
 * 4)   during the, the two-day period of the day of  and the preceding day's
 * , moxibustion traditionally performed on the second of February or August in the belief that this conferred year-long good health

Etymology 2
Compound of. Generally only found in instances of counting, as in.

First cited in 1746.

Noun

 * 1)   two days, a two-day period