can anyone help me to find a lexicon for a specific subject..

0i appreciated this site i found many interseting subjects and iam eager to learn more, and wish also to find help in this site because i need to find some lexicon about specific subjects wether is it in translation matter, literature, science ect..... because i searched in many sites about this and couldnt find i think i didnt find because i didnt use the correct key word because it's very new for me and wish that i can find help here in this site .02br
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00 thanks0-