Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Perseus.
The word Machabæus could not be parsed. Trying a normal dictionary lookup:
No entries found. Showing closest matches:
Machabaeus, i, m., a surname of Judas, Vulg. 1 Macc. 1, 2 et saep.
Hence, Machabaei, ōrum, m., the Maccabees, Aug. Civ. Dei, 18, 36; Hier. Ep. 7, 6.