The Diigo Reference list (see Useful Links page for this and other lists) includes many useful resources including Mathematics dictionaries.
Note – click on the green links to go direct to each site then back on your browser if you wish to return to the list.
Note that these resources are also given on my blog written for students.
Two particularly useful dictionaries for students of all ages are those from Jenny Eather
(Note the excellent section on charts also).
There are many resources suitable for older students also, see for example the thesaurus from Cambridge University.
This site includes user guides with suggestions for teachers and students.
The Diigo Reference list also includes sites on the history of Mathematics.
Checking the University of St Andrews site we can find out about mathematicians who were born or died on this day.
LiveBinders version of Mathematics reference materials.
