Best format to create dictionary

Hi!

There are many topics and pages on how to create/convert custom dictionary for Kobo.
I have quite big database consist of
- word,
- definition (multiline, html formatted),
- inflections (forms?)

It's polish-polish source.
I do export this database to html which then i convert with kindlegen to mobi file.
I do not own any Kobo device and i have no idea how to make it 'the good and easy' way.
I was thinking that penelope has ability to convert from babylon to Kobo on the fly (i'm looking for CLI software), but it doesn't. But first i made scripts, and then checked =/

I was thinking about creating .tab Source, but can not find (it's quite late in Poland ;)), at the moment, any useful information about doing it with inflections.
Found this page too - it's cool, but again - no inflections (?!).

Am i missing something or it is not The Way?

Regards!