Mud
noun, の adjective
The kanji and the word are exactly the same. That means they share meanings as well.
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You learned this reading with the kanji, but here's a mnemonic in case you need a refresher:
You may know of Dora the Explorer. But have you heard about her dirty, muddy brother, Doro (どろ)? They're like a team. And because of all the exploring he does, Doro is always covered in mud.
「おい、ちょっと待て！お前今、床に泥を付けただろ？」「えっ！泥なんて付けてませんよ。私のうんこなら付けましたが。」
"Hey, hold on! Did you just get mud on the floor?" "Oh! It’s not mud. It’s actually my poop."