Noun
(Judaism) A section of a book in the Hebrew text of the Tanakh, which may be open (a petuhah) or closed (a setumah).
(Judaism) One of 54 sections of the Torah read weekly by religious Jews, particularly in the synagogue on the morning of the Jewish Sabbath
Source: en.wiktionary.orgThere is Zohar on all of the parashahs of Bereishit through the book of Vayikra; in Bamidbar there is no Zohar on the last two parashas: Matot (although on this parashah there is a small paragraph on page 259b) and Mas'ei. Source: Internet
Volumes II and III begin their numbering anew, so citation can be made by parashah and page number (e.g. Zohar: Nasso 127a), or by volume and page number (e.g. Zohar III:127a). Source: Internet