梵名 Śronakotīvijśa 或 Śrotravijśatikotī。譯作室縷多頻設底拘胝。又稱億耳羅漢、聞二百億。乃中印度伊爛拏鉢伐多國長者之子。彼受佛陀教化出家後，居舍衛國獨住安靜，刻苦精勤，日夜不寢，修習道品。以不能盡除諸漏，乃罷道歸家。佛知後召之，問在俗時有何嗜好？答以好彈琴。於是佛對彼云：琴絃若急，則不可得和音愛樂，若琴絃緩，亦無和音愛樂。惟在不急不緩時，始能得其中和。同此，過分精進能擾亂此心之調和，不夠精進也易使心懈怠。億耳聆訓之後，遂復其志，心無放逸，修行精勤，遂證阿羅漢果。其後，億耳遊化南印度，寂於恭建那補羅國。師足下毛長二寸，足不踏地，為佛弟子中精進第一。〔雜阿含經卷九、大智度論卷二十二〕

佛光電子大辭典

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Sronakotīvimśa. Defined as the most zealous of Śākyamuni's disciples, who became an arhat. Having lived in a heaven for ninety-one kalpas, where his feet did not touch the ground, he was born with hair on his soles two inches long, an omen which led his father and brothers to endow him with twenty kotis of ounces of gold, hence this name. v. 智度論 22.

A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous

（人名）Sronakotīvimśa，比丘名。佛在世時證阿羅漢果。足下毛長二寸，足不踏地，為弟子中精進第一，智度論二十二曰：「沙門二十億耳，鞞婆尸佛時作一房舍，以物覆地，供養眾生。九十一劫天上人中受福樂果，足不踏地，生時足下毛長二寸，柔軟淨好，父兄歡喜，與二十億兩金，見佛聞法，得阿羅漢，於諸弟子中精進第一。」增一阿含經三曰：「勇猛精進堪任苦行，所謂二十億耳比丘是。」

丁福保《佛學大辭典》