The Collaborative International Dictionary of English v.0.48:

Abib \A"bib\, n. [Heb. ab[imac]b, lit. an ear of corn. The month
   was so called from barley being at that time in ear.]
   The first month of the Jewish ecclesiastical year,
   corresponding nearly to our April. After the Babylonish
   captivity this month was called Nisan. --Kitto.
   [1913 Webster]