Tree Trunk
noun
The kanji and the word are exactly the same. That means they share meanings as well.
みき
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You did not learn this reading, so here's a mnemonic to help you remember: When you cut the tree down to produce a tree trunk, out jumps Mickey Mouse. "WHY YOU CUT DOWN MY TREE BRO?" he yells. I'm Mickey Mouse and I don't stand for this.
誰だ、幹にキズを付けたのは。
Who scratched the tree trunk?!
その木の幹をなでた時、木のさびしさにふれた気がしたんです。
When I rubbed the tree trunk, I felt as if I’d touched the loneliness of the tree.
木の幹に絡まっているツタを取り除いた方がいいよ。
You should remove the ivy winding around the tree trunk.