Dictionary:

hemolysin

  (hĭ-mŏl'ĭ-sĭn, hē'mə-lī'-)

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An agent or substance, such as an antibody or a bacterial toxin, that causes the destruction of red blood cells, thereby liberating hemoglobin.

An antibody that causes hemolysis of red blood cells in vitro.

An agent or a substance, such as an antibody or a bacterial toxin, that causes the destruction of red blood cells, thereby liberating hemoglobin. Also called erythrocytolysin, erythrolysin.

A substance that liberates hemoglobin from erythrocytes by interrupting their structural integrity.

The noun has one meaning:

Meaning #1: any substance that can cause lysis (destruction) of erythrocytes (red blood cells) and the release of their hemoglobin
  Synonyms: haemolysin, erythrolysin, erythrocytolysin