Hyaloplasm, also known as cytosol or protoplasm, refers to the gel-like substance that fills the interior of cells. There are various synonyms for the word hyaloplasm, including cytoplasm, cell sap, and intracellular fluid. Other synonyms commonly used in scientific literature include protoplasm, cellular microenvironment, and cell matrix. The term cytosol is primarily used to describe the soluble fraction of the cytoplasm, with the remaining insoluble portion referred to as organelles. As researchers continue to discover more about the complex inner workings of cells, new terminology may be developed, revealing even further synonyms for this key cellular component.