Yes, you're right that "Wörterbuch" is "dictionary".
And "Handwörterbuch" can have two meanings: like you two mentioned, a big, concise dictionary with longer explanations, and - joy of the German language - it is also used for the contrary, for a shorter dictionary, that you can put into your "Handtasche" - handbag. But with the word "großes" in the title it has the first meaning here (from Handbuch - compendium).
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