Dictionary Definition :
Definition[1]
:
The heretics of the six austerities are referred to as 六苦行外道; v. 六行.
Source
:
A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Definition[2]
:
六苦行===(名數)與六行同,外道六種之苦行也。【參見: 外道】下。
Source
:
丁福保《佛學大辭典》