Can you trademark a word in a dictionary?


<https://www.theverge.com/2013/7/31/4574878/microsoft-skydrive-name-change-bskyb>


Sky trademarked the word Sky, so I am wondering if words such as Tornado, Banner and Diesel could also be trademarked. Someone said to me. We can't, but Microsoft had to change Skydrive to OneDrive due to Sky. The fact that the British Sky Broadcasting Group owns the word Sky sounds ludicrous to me.



Can you trademark a word in a dictionary?