The actual nature of the mind – either the voidness (emptiness) of the mind or the voidness of the deep awareness (ye-shes) of the mind – when tarnished by fleeting stains. According to some commentaries, it includes only the naturally abiding Buddha-nature family-traits; according to others, it also includes the evolving Buddha-nature family-traits. Synonymous with Buddha-nature source (khams) and Essential factor for a Thusly Gone One (de-gshegs snying-po).
Tibetan: de-gshegs snying-po
Synonyms: Essential factor for a Tathagata; Womb for a Thusly Gone One; Womb for a Tathagata