Hebrew Addar. (See ADDAR). Southern boundary of Judah and the Holy Land, called also Hazar-Addar: Jos_15:3. (See HAZAR-ADDAR).
Fausset's Bible Dictionary
By Andrew Robert Fausset, co-Author of Jamieson, Fausset and Brown's 1888.
ā-?dar (אדר, 'ădhār, meaning uncertain): The Babylonian name of the twelfth month of the year. Used in the Bible only in Ezr_6:15 and eight times in Esther. At first the author in Esther defines Adar as the twelfth month, but afterward omits the numeral. In order to maintain the relation of the year to the seasons it was customary to add a second Adar, as often as was needed, as an intercalary month.
International Standard Bible Encyclopedia
PRINTER 1915.