The Collaborative International Dictionary of English v.0.48:

Missal \Mis"sal\, n. [LL. missale, liber missalis, from missa
   mass: cf. F. missel. See 1st Mass.]
   The book containing the service of the Mass for the entire
   year; a Mass book.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Missal \Mis"sal\, a.
   Of or pertaining to the Mass, or to a missal or Mass book.
   --Bp. Hall.
   [1913 Webster]

WordNet (r) 3.0 (2006):

missal
    n 1: (Roman Catholic Church) a book containing all the prayers
         and responses needed to celebrate Mass throughout the year