yas यस्

Definition: tad. affix य with mute स् to indicate the application of the term पद् to the preceding base as a consequence of which the final म् of the words कम् and शम्, after which यस् is prescribed, gets changed into anusvara e. g. कंयु:, दंयु:: cf P.W.2.138.

Dictionary: Abhyankar
Literary Sources: