ὁπλιτοδρόμῳ
ὁπλιτοδρόμος, running a race in armour
Morpho works with a static database. If you like, you can compare the output of Morpheus.
Parsed as:
masculine dative singular of ὁπλιτοδρόμος
No checked forms of ὁπλιτοδρόμος in the morphology database.