what is dhatu ro
Dhaatu roop.
It is just like the 4 forms of a verb.
It refers to the way or form of a dhaatu (verb) like ekvachan or dwivachan or bahuvachan. Also like 'you go', 'you went', 'you have gone'.
Example: gam dhaatu
gacchati=he/she goes
gachhasi=you go
gachhaami=I go