Quarterns, also known as quarters, are units of measurement that are commonly used in the food industry. They are typically used to measure quantities of ingredients, such as flour, sugar, and rice. However, there are various synonyms that can be used to refer to quarterns. For instance, the word 'fourth' can be used to represent a quartern, while 'one-fourth' and 'quarter' are also synonymous terms. 'Twenty-five percent' is another synonym that can be used to refer to a quartern, as it represents the fraction that is equal to one-fourth. Overall, there are many different ways to express the idea of a quartern through the use of synonyms.