noun
kanji 'hole' radical at top (穴)
Refers to the kanji radical 穴 (あな) when it appears at the top of a character, such as in 空, 究, or 窓. Used in discussing kanji structure.
「空」の上の部分は穴冠と呼ばれます。
The top part of '空' is called 穴冠 (anakanmuri).
Mixed kana spelling, also used.
Compound of 穴 (あな, 'hole') and 冠 (かんむり, 'crown'), referring to the radical's position at the top of a kanji.