Dr. Grauer will continually update and expand his Glossary, to to see the newest version, follow this LINK.  This Glossary of ECG Terms, published by Dr. Ken Grauer, is intended to accompany his newest publication, "A 1st Book on ECGs-2014".   It is not meant to be a complete glossary of all ECG terms, but is very good for helping your students navigate the early lessons.  They will  find Dr. Grauer's book very helpful, also.  It is a brief introduction to ECG which enables the reader to prepare for their first ECG class.  It is written in a very easy format, with lots of illustrations.  There is even a section on the history of ECG, which makes the subject much more interesting!   Even people who do not need to interpret ECGs will find this book very interesting, as it explains"what" an ECG is.  Dr. Grauer's readable style is perfect for beginners.