Only replying because I'm not a fan of Perseus (Latin on-line
dictionary). If anyone needs/wants to look up Latin words on-line, I
recommend Words by William Whitaker (found at
http://lysy2.archives.nd.edu/cgi-bin/words.exe).
It has helped me through four semesters of Latin and is helping me in my
fifth. With Whitaker you don't need to know the original word a derived
word is from. Hope this helps for anyone researching the meaning of Latin
words on-line.