If I understood what are you searching for, this one could be good: http://www.priberam.pt/dlpo/leiam

You mean you need a Portuguese-English dictionary?

Kamenko's recommendation is pretty good, but depending on your level, a Portuguese dictionary may not be what you need. What's the point in having a dictionary if you don't understand the words involved in the explanation of a concept? Since it's far from to to make assumptions of your Portuguese level, I vouche for Kamenko's recommendation, though it lacks something important - contextual examples. I've never seen a printed dictionary which offered these, though, so unless taking notes is that important, online dictionaries like priberam are a better option.

You can download an app on play store

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