The Collaborative International Dictionary of English v.0.48:

Legist \Le"gist\ (l[=e]"j[i^]st), n. [F. l['e]giste, LL.
   legista, fr. L. lex, legis, law. See Legal.]
   One skilled in the laws; a writer on law. --Milman. --J.
   Morley.
   [1913 Webster]