Macistus or makistos is a term derived from Doric Greek meaning tallest or greatest.
Mythology
Makistios was an epithet of Heracles, who had a temple in the neighbourhood of the town of Macistus in Triphylia, Elis (Peloponnese). Macistus was also a son of Athamas and brother of Phrixus, from whom the town of Macistus in Triphylia was believed to have derived its name.
References
Macistus Wikipedia(Text) CC BY-SA