Is there a way to add Spanish to English dictionary in mac's dictionary app so I can see the definition of word by tapping on a word?
Apple has introduced Spanish to English dictionary in Yosemite.
You can enable the dictionary named "Gran Diccionario Oxford - Español-Inglés • Inglés-Español" by going to Preferences of Dictionary app.
You will have to search the internet for one that someone has made. Some others can be found at
Let me know if you find Spanish-English so I can add it to the list.