We have chosen to separate this word from the otherwise common form triṣuta (MD 114a) on the assumption that it is related to Persian drust "right"; but at best, as the parallel expressions in GY riš drisutak, riš triṣutak demonstrate, as well as the absence of triṣuta from the expansive list of positive attributes in the first citation, it is simply a variation of the other word influenced by the Persian one.