kanji 'grass' radical (radical 140)
Refers to the radical 艸 (くさかんむり) when used as a dictionary component, e.g. top of 艾. Compare with 草冠, which is the more common name for the same radical.
See also: 草冠
'艸部' is one of the kanji radicals, referring to the same component as 草冠.