*אַרְבּוּנָא, (ארב, cmp. ערב) confounding of colors, thickness, whence feeble sight. Pes. 111ᵇ the following three things יהיבי א׳ וכ׳ (Ms. Oxf. עוורונא; Ms. M. v. Rabb. D. S. a. l.) cause defective eye-sight.