I use Plucker on a Palm TX, and I generally do look up words that I don't know, since it's so easy (tap on word, and you go to the dictionary, assuming you set up PPI correctly). How often I come across words that I don't know depends what I am reading. If I am reading Shakespeare, it's not at all uncommon. If I am reading scifi, it doesn't happen almost at all. If I had to use a physical dictionary, I probably would rarely bother. But if it's just a tap (or three--sometimes one needs to scroll a little in the dictionary), why not?
When I'm reading Scripture with PalmBible+ on the TX, I do look up Hebrew and Greek words from time to time, but that's a rather specialized use.
In fact, having lots of dictionaries, whether for use while reading or just for ease of reference, is one of the best uses for a portable reading device. My Palm TX's dictionary collection includes a 1694 French-French dictionary (yes, it's old, but the French texts I care about are all from that era), an 1835 French-French dictionary, Latin-English, Strong's Hebrew/Greek Lexicon, Webster's 1913, Wordnet 3.0, Dal's Russian-Russian dictionary, and some astronomical reference data (NGC/IC and SAC catalogs). It's much easier to look up on the PDA than to leaf through a heavy volume.
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