一切經音義 15.225

15.225

牢𩋸（上音勞從牛從宀省下五更反字書牢固也從革更聲經作硬俗字也）。

牢𩋸 (Firm and hard: the upper character has the sound of 勞 [láo], composed of 牛 and an abbreviation of 宀. The lower character has the fanqie 五 + 更 [yìng]. Dictionaries state that it means 'solid and firm.' Composed of 革 with 更 phonetic. In the sūtra, writing it as 硬 is a vulgar character).