a-vi-ra-hūm-kham, (or āḥ-vi-ra-hūm-kham the Shingon 'true word' or spell of Vairocana, for subduing all māras, each sound representing one of the five elements, earth, water, fire, wind (or air), and space (or ether). Also, 阿毘羅吽欠 (or 阿尾羅吽欠 or阿尾羅吽劍 or阿毘羅吽劍); 阿味囉 M020011欠.

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

梵語 a vi ra hūj khaj。悉曇字 。密教胎藏界大日如來之真言，象徵大日如來之內證。全稱唵阿卑羅吽欠莎婆訶。又作阿毘羅吽欠。以聚集此五字之種子，故亦稱為五字明。於密教，此五字又象徵宇宙一切生成要素之地、水、火、風、空等五大，故以此五字配於五大，即阿字配於地大，卑字配於水大，羅字配於火大，吽字配於風大，欠字配於空大。蓋此真言涵攝一切萬象，若行者稱念「唵阿卑羅吽欠莎婆訶」即能成就一切法。此真言之特色乃在始於唵（oj，歸命），而後終於莎婆訶（svāhā，成就）；故於密教視之為諸佛之通咒、薩埵之總印。〔大日經卷三悉地出現品、大日經疏卷十一、祕藏記〕p3626

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