sacred ibisEnglishOxford New American Dictionarysacred ibis /ˈsākrid ˈībis, ˈseɪkrɪd ˈaɪbɪs/ ▸ noun a mainly white ibis with a bare black head and neck and black plumes over the lower back, native to Africa and the Middle East, and venerated by the ancient Egyptians. Threskiornis aethiopicus, family Threskiornithidae.