The affix yus is added to ūrṇā in the sense of matup in the chandas (Vedas).,
The स् of युस् makes the word ऊर्णा a पद 1.4.16; the result of which is that rules applicable to भ Bha do not apply; e. g. (VI. I. 148), by which the final इ or ई, अ or आ is elided. Thus ऊर्णायुः ॥ According to some; छन्दसि is to be read in this sutra. The author of Siddhanta Kaumudi says that this is reasonable; for if yus is added to urna in secular literature also, then there was no necessity of this sutra. The word urna could have been read along with aham and subham in 5.2.140.,