Definitions of Wassermann:

• noun:   German bacteriologist who developed a diagnostic test for syphilis (1866-1925)
• noun:   a blood test to detect syphilis; a complement fixation test is used to detect antibodies to the syphilis organism treponema; a positive reaction indicates the presence of antibodies and therefore syphilis infection
• name:  A surname (very rare: popularity rank in the U.S.: #76329)