Trading Glossaries and Online Dictionaries

Barkley's Comprehensive Financial Glossary
Campbell Harvey's Futures and Options Glossary
Center for Futures Education's Guide to Futures and Options Market Terminology
Global Investor's Glossary
The most comprehensive glossary of it's type I've seen. Terms are explained with videos and graphics as well.
Glossary of Technical Analysis Terms
Index of Technical Indicators
InvestorWords.com

The best Futures and FOREX Charts ANYWHERE!

Litwick.com - Glossary of Candlestick Charting Indicators
Nebguide Livestock Market Terms
Numa Derivatives Internet Collection of Glossary Links
Numa Dictionary of Derivatives Acronyms
Steven B. Achelis' Technical Analysis Reference, from A to Z
Technical Indicator Glossary - Part 1
Technical Indicator Glossary - Part 2
Traders' Glossary of Technical Terms and Topics
Trendy Systems Glossary of Commodity Symbols