V. S. Apte, The Practical Sanskrit–English Dictionary. Look up any word of the Gita in Devanagari, IAST or Harvard-Kyoto, or browse the headwords letter by letter.
Entry तुत्थ
तुत्थtutthaFire.
[तुद्-थक्]
Fire.
A stone.
Derived forms and compounds
-त्थम् Sulphate of copper, usually applied to the eyes as a sort of collyrium or medical ointment.
-त्था
Small cardamoms.
The indigo plant.
-अञ्जनम् blue vitriol applied to the eyes as a medical ointment.