WordNet (r) 3.0 (2006):

Naomi
    n 1: the mother-in-law of Ruth whose story is told in the Book
         of Ruth in the Old Testament [syn: Naomi, Noemi]

Easton's 1897 Bible Dictionary:

Naomi
   the lovable; my delight, the wife of Elimelech, and mother of
   Mahlon and Chilion, and mother-in-law of Ruth (1:2, 20, 21;
   2:1). Elimelech and his wife left the district of
   Bethlehem-Judah, and found a new home in the uplands of Moab. In
   course of time he died, as also his two sons Mahlon and Chilion,
   who had married women of Moab, and three widows were left
   mourning the loss of their husbands. Naomi longs to return now
   to her own land, to Bethlehem. One of her widowed
   daughters-in-law, Ruth, accompanies her, and is at length
   married to Boaz (q.v.).


Hitchcock's Bible Names Dictionary (late 1800's):

Naomi, beautiful; agreeable