pentekostys means A group of fifty men in the Ancient Greek army. Lexicurio rates it Sui generis — a strength score of 95 out of 100.
Etymology
Learned borrowing from Ancient Greek πεντηκοστύς (pentēkostús), from πεντηκοστός (pentēkostós, “fiftieth”).
noun
- A group of fifty men in the Ancient Greek army.