Business & Finance I need some help with definitions of terms commonly used in conjunction with hydropower. Where can I find a “dictionary” of hydro terms? By - 6.12.2017 The “Hydropower Glossary” is a great reference. This booklet provides definitions of 300 terms commonly used in the hydroelectric industry. It’s a “must have” for all hydro professionals! To order the booklet click here for the order form.