Entry 2 senses · 2 variants Webster, 1913 Missal /mĭs'-əl/ · Mis·sal · IPA /ˈmɪsəl/ n. a. 01 n. The book containing the service of the Mass for the entire year; a Mass book. 1. The book containing the service of the Mass for the entire year; a Mass book. 02 a. Of or pertaining to the Mass, or to a missal or Mass book. 1. Of or pertaining to the Mass, or to a missal or Mass book.