seronegative

The term is a modern scientific compound, formed in the early 20th century within the field of immunology. The first element, "sero-," derives from the Latin serum, which originally referred to the watery part of milk (whey) and was later adopted in medicine to denote the clear, fluid portion of blood. The second element, "negative," comes from the Latin negare (to deny), via negativus. Combined, the word literally means "serum-denying," logically describing a test result where the serum lacks detectable evidence (antibodies or antigens) of a specific infection or condition, thus indicating a negative status.

Structure: sero (serum) + negative (negative) - sero: From Latin serum, meaning "whey" or "watery fluid." In modern medical terminology, it refers to blood serum. It functions as a combining form denoting a relationship to serum. - negative: From Latin negativus, meaning "denying." It functions as an adjective indicating the absence or denial of a specific condition or result.