Furthermore, Still, More, Greater
adverb, conjunction
The kanji and the word are exactly the same. That means they share meanings as well.
なお
Since this word is made up of a single kanji, it probably uses the kun'yomi reading. You haven't learned this reading yet, so here's a mnemonic to help you: When do people tend to use the word furthermore? Right now (なお)!
温めて食べたら、尚、おいしくなりますよ。
If I warm it up and eat it, it becomes even more delicious.