Topics allied to forest reproductive material are full of jargon. We have provided links to some list of terms and glossaries, in case you are confused. There are many on the web.
7.8.1 FAO Terminology
For further information, visit the webpublication:
http://www.fao.org/faoterm/DEFAULT.htm
7.8.2 SilvaVoc - FAO
Visit http://iufro.boku.ac.at/silvavoc/fgr-glossary/