Sentence:  ...it is a time-honored custom that when women bake <WSD>"challah</WSD>"-loaves for Sabbath and "Yom Tov" use, they specifically prepare a dough large enough to be obligated in <WSD>"challah</WSD>", so they can fulfill the mitzvah of separating <WSD>"challah</WSD>".... 
Meaning of the word marked with <WSD> tags:  A traditional bread eaten by Ashkenazi Jews, usually braided for the Sabbath and round for Yom Tov.