συνεπιθρηνῶν
συνεπιθρηνέω, join in bewailing
Morpho works with a static database. If you like, you can compare the output of Morpheus.
Parsed as:
present active participle masculine nominative singular of συνεπιθρηνέω
No checked forms of συνεπιθρηνέω in the morphology database.