DAtutantra
dhātu-tantra , nt. , ‘science of dhātu’ (in which sense? possibly 2, the bodily elements, physiology? ), one of the subjects studied in school: LV 124.16 ( vs ); prec. by saṃkhyā, lipi, gaṇanā; no clue to precise mg. in context, nor in Tib. which renders mechanically khams kyi rgyud .