Nisan[nē sän′, nis′ən]
Nisan definition by Webster's New World
Origin: Classical Hebrew (language) nīsān
Nisan definition by American Heritage Dictionary
Origin: Hebrew nîsān, from Akkadian nisānu, the first month in the Babylonian calendar (corresponding to parts of March and April), from Sumerian nisag, first fruits : nig, ni, thing, nominalizing pref. + sag, head, top, first.