Source : Webster's Revised Unabridged Dictionary (1913)

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.

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

Source : WordNet®

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