Jastrow: אֲדָר

אֲדָר, (אָדָר) m. (b. h., Assyr. the cloudy; v. Fred. Delitzsch, The Hebr. Lang. p. 15) Adar, the twelfth month of the Jewish calendar, containing twenty nine days, and varying between the eleventh of February and the twenty eighth of March. In leap years: א׳ רִאשֹׁון First Adar, of thirty days duration between the thirty first of January and the tenth of March; א׳ שֵׁנִי Second Adar, of twenty nine days, between the second of March and the eighth of April. Targ. II Esth. IX, 29; a. fr.—Meg. I, 4; a. fr.—Pl. אֲדָרִים, אֲדָרִין. R. Hash. 19ᵇ