一切經音義 7.124

7.124

Deep and profound (shen'ao 深奧: the lower word is [pronounced with the fanqie] wu + gao [ao]; also pronounced yu + liu [yu]; the meanings are the same. The Guangya says: 'Ao 奧 means stored away.' Guo's commentary on the Fangyan says: 'The hidden, recessed corner of a room.' The Shuowen says: 'To penetrate deeply; the southwest corner of a room; it is categorized under cave 穴 with [山/兀/廾] as phonetic; [山/兀/廾] is pronounced gong + liu [gong]; below it is gong 廾 [gong], above it is the ancient character for six 六; mian 宀 is pronounced mian 綿. Writing it with rice 米 as 奧 is incorrect.').