The term 'BLOOD prefix' refers to a group of words that are used to describe something related to BLOOD. The crossword solutions for this term include HEMA (4 letters), HEMATO (6 letters), HAEM (4 letters), HEMO (4 letters), HAEMA (5 letters), HAEMO (5 letters), and HEMAT (5 letters). All of these words are derived from the Greek word 'haima, ' which means 'BLOOD.' They are commonly used in medical terminology to refer to various aspects of the circulatory system, such as the red BLOOD cells, white BLOOD cells, and platelets.