The Collaborative International Dictionary of English v.0.48:

Menologium \Men`o*lo"gi*um\, Menology \Me*nol"o*gy\, n.; pl. L.
   Menologia, E. Menologies. [NL. menologium, fr. Gr. mh`n
   month + lo`gos discourse : cf. F. m['e]nologe.]
   1. A register of months. --Bp. Stillingfleet.
      [1913 Webster]

   2. (Gr. Church) A brief calendar of the lives of the saints
      for each day in the year, or a simple remembrance of those
      whose lives are not written.
      [1913 Webster]