I didn't know that myself, but that is very true! Chumash in general refers to a printed Torah, as opposed to a Sefer Torah, which is the scribally-transcribed (is that a redundancy?) Torah scroll. The Chumashim (singular Chumash) with which I am familiar from the times that I have attended prayer services at the synagogues of friends and acquaintances, is separated into weekly "Torah portions", called parashas in, I believe, Hebrew (sometimes when you are dealing with Orthodox Judaism, it is difficult to be certain whether the terminology being used is Hebrew or Yiddish in origin) for each week of the year. Each parasha contains prayers and readings from the Torah/Pentateuch, the quasi-historical books just following the Pentateuch (the Hebrew name of which I forget), and the books of the prophets (if I remember right, collectively called Nevi'im, plural of Navi "prophet", in Hebrew). In a similar way, the Roman Catholic Missal has readings from the "Old Testament", from the Pauline Epistles, and from the Gospels, for each day or week of the year (depending on whether you are looking at a daily or Sunday Missal). It is in this capacity as a prescribed weekly prayer book that I likened the Chumash to the Roman Missal which I grew up using.No, they aren't. The word refers to the first five books of the Torah in printed form.