Agriculture (general):http://www.oznet.ksu.edu/library/MISC2/SB661.PDF http://www.pfb.com/resources/ag-information/glossary-of-ag-terms.htm http://www.ipm.ucdavis.edu/PMG/glossary.html
Biotechnology: http://plpa.cfans.umn.edu/~neviny/cfan1501/definitions.html
Entomology: http://www.bijlmakers.com/glossary/search.php
Environment: http://www.epa.gov/OCEPAterms/aterms.html
Pesticides/Pests: http://www.pesticide.org/get-the-facts/ncap-publications-and-reports/healthy-kids-healthy-schools/learning-ideas/learningglossary.pdf/view
Phytopathology: http://ppathw3.cals.cornell.edu/glossary/Glossary.htm
Water: http://www.edwardsaquifer.net/glossary.html http://ga.water.usgs.gov/edu/dictionary.html
Many Glossaries:http://www.jump.net/~fdietz/glossary.htm