The term 'Biological Suffix' refers to a type of suffix used in the scientific field of biology. The two crossword solutions for this term are 'cyte' (4 letters) and 'plasm' (5 letters). Cyte is a suffix used to refer to a cell or cells, while plasm is a suffix used to refer to a substance or material that is found within a cell. Both of these suffixes are commonly used in the field of biology to describe various components of living organisms.