Charak Samhita
तिल्वकस्तु मतो लोध्रो बृहत्पत्रस्तिरीटकः। तस्य मूलत्वचं शुष्कामन्तर्वल्कलवर्जिताम्॥३॥
॥ Synonyms॥ Lodhra (One which overcomes kaphapittadi diseases), brihatpatra (plant which has big leaves), tilvaka (which oleates the body) are the synonyms of tilwaka. ॥ Processing of tilvaka twak॥ External layer of tilvaka root is taken and internal portion is discarded.
english translation
tilvakastu mato lodhro bRhatpatrastirITakaH। tasya mUlatvacaM zuSkAmantarvalkalavarjitAm॥3॥
hk transliteration by Sanscript