This literally translates to "sweet herb."
You may also see it referred to as:
* யூஸ்டிஸ் (Yustis), which is the Tamil transliteration of "Eustace"
* மருந்து வேர் (Marunthu Ver), meaning "medicine root"
The specific Tamil word might depend on the context, but "Inippu Mooligai" is the most common and accurate translation.