Tail
noun
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 should use the kun'yomi reading. You haven't learned this reading yet though, so here's a mnemonic to help you:
You look down and you've sprouted a tail! You're so shocked that all you can say is "Oh. (お) Oh okay..." This your life now. A life with a tail.
このカメ、尾がトゲトゲしててカッコいい！
This turtle has a spiky tail; it looks so cool!
私の特技は、魚の尾を見ただけで魚の種類を当てることです。
My special skill is being able to identify the type of fish just by looking at its tail.
友達に「お前の鳥の尾、短くない？」って言われたこと、まだ尾を引いてるんですよね。
I'm still hung up on my friend saying, "Isn't your bird's tail short?"