This page offers links to a multitude of online dictionaries or smartphone apps. They will be of great resource to you and even more so to a student or congregant. Harkavy Yiddish Dictionary Jastrow Dictionary Yiddish Dictionary Online Yiddish Expressions Roshei Teivot iPhone Hebrew/English translator 
The goal of this dictionary is to provide a genuine picture of the true Kabbalah. In the rare books that deal seriously with the subject, the concepts of the Zohar and the Kabbalah are often quoted but not explained. The study of Kabbalah involves a good comprehension of its general idea, as well as its... Read more »