Dictionary Definition :
Definition[1]
:
諸經所說八大觀音之名有異,而以如下二說最為普遍,一說為:不空罥索、毘俱胝、十一面、馬頭、忿怒鉤、如意輪、不空鉤、一髻羅剎等八大觀音。另一說為:如意輪、觀自在、得大勢、多羅、毘俱胝、白處、一髻羅剎、馬頭等八大觀音。〔如意輪陀羅尼經壇法品〕
Source
:
佛光電子大辭典
Page
:
p275
Definition[2]
:
The eight Shingon representations of Guanyin: as one of the above 八大明王, as the white-robed one, as a rāksasī, as with four faces, as with a horse's head, as Mahāsthāmaprāpta 大勢至, and as Tārā 陀羅.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[3]
:
(名數)真言宗所立,據大本如意經之說。一圓滿意願明王菩薩,二白衣自在,三髻羅剎女,四四面觀音,五馬頭羅剎,六毘俱胝,七大勢至,八陀羅觀音也。
Source
:
丁福保《佛學大辭典》