Haematohiston is a term that is related to the study of biochemistry. It refers to a protein compound that is present in red blood cells and is responsible for the pigment associated with the cells. Haematohiston can also be referred to as hemoglobin, which is a commonly used synonym for the term. Other synonyms that can be used include erythrocruorin, sanguine, and heme. These terms all refer to substances that are involved in the transport of oxygen within the body. While these terms share a similar definition, they can be used interchangeably depending on the context in which they are used.