yājakāderākṛtigaṇatvāt karmaṇyaṇaṃ vā vidhāya svārthikaṃ ko vidheyaḥ /
The word "vedaka" is [derived] either because it belongs to the group [of words] beginning with "yājaka", or by applying the suffix "aṇa" in the passive sense along with the reflexive [suffix] "ka".