On-Line Chemistry Dictionaries

Best one for first year chemistry students:
http://home.nas.net/~dbc/cic_hamilton/dictionary/a.html  

Check here if you can't find your word in the above site: http://misterguch.brinkster.net/bigdictionary.html 

 http://library.thinkquest.org/10676/dict.html 

http://www.shodor.org/unchem/glossary.html 

And, if these aren't enough....check this site out for a BUNCH more! http://www.chemistrycoach.com/periodic_tables.htm#Periodic%20Tables