Also see definition of "Nisan" in Bible Study Dictionaries
Word Study
Nisan
CIDE DICTIONARY
Nisan, n. [Heb. nīsān.].
The first month of the Jewish ecclesiastical year, formerly answering nearly to the month of April, now to March, of the Christian calendar. See Abib. [1913 Webster]
Also see definition of "Nisan" in Bible Study Dictionaries
For further exploring for "Nisan" in Webster Dictionary Online