Adobe reader can't use Apple dictionary to show meanings of words I read in a pdf book.any help?

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!When I read same pdf book in my iBooks app,I can select any word and click "look up" to get meaning in my Apple system dictionary. But the same doesn't work with Adobe acrobat reader on my iPad mini 2. An option does come up when I select a word to get it's meaning as "dictionary" but when I go on to click it,it looks like it misread the word I jus selected! For example if I select the word "Question",my Adobe reader tries to search for "G7EF;A" . I find it very inconvenient.

please suggest a solution or improve the app ASAP if you think it's really a bug in there.

thank you.