This paper investigates the meaning and the etymology of TB pitke. Based on a philological study of Sanskrit, Chinese and Tibetan parallel texts, the meaning of TB pitke can be determined to be ‘fat, grease, oil’. TB pitke corresponds to Skt. medas- ‘fat’, Tib. tshil ‘fat, grease’ and Chin. 脂zhī ‘fat, grease’. The philological identification of the meaning of TB pitke as ‘fat, grease, oil’ opens the door to an etymological connection with PIE *pei̯H- ‘to be fat, swell’, and, based on the historical phonology of Tocharian, leads to the determination of the laryngeal as *‑h 1 .