The Collaborative International Dictionary of English v.0.48:

Syllabus \Syl"la*bus\, n.; pl. E. Syllabuses, L. Syllabi.
   [L., fr. the same source as E. syllable.]
   1. A compendium containing the heads of a discourse, and the
      like; an abstract.
      [1913 Webster]

   2. (Law) The headnote of a reported case; the brief statement
      of the points of law determined prefixed to a reported
      case. The opinion controls the syllabus, the latter being
      merely explanatory of the former.
      [Webster 1913 Suppl.]