Just a few links for my (and potentially your) reference for some online Chinese to Chinese dictionaries. The links are in increasing order of difficulty (e.g. Children’s Concise, to Children’s, to regular [with a lot of literary references to some entries; really interesting!], idioms, and character variants).

Kids Mini (GREAT place to start!):

http://140.111.1.43/cgi-bin/gdic/gsweb.cgi?o=ddictionary

Kids:

http://140.111.34.46/jdict/main/cover/main.htm

Regular dictionary:

http://140.111.34.46/newDict/dict/index.html

Idioms:

http://dict.idioms.moe.edu.tw/

Chinese Character Variants:

http://dict.variants.moe.edu.tw/

Hope they’re helpful!