續一切經音義 7.89

7.89

牸牛（上疾吏反顧野王畜母也方言云牛牝曰牸牡曰特其子曰犢也皆從牛形聲也）。

牸牛 [Cow (female cattle)]: The upper [character] has the fanqie 疾吏 (jí + lì = zì); Gu Yewang says, “A female domestic beast.” The Fangyan says, “Female cattle are called 牸, males are called 特, and their calves are called 犢.” All derive from 牛 as phonogram-ideograms.