[hi-mol-i-sin, hee-muh-lahy-, hem-uh-]
noun Immunology.
a substance, as an antibody, that in cooperation with complement causes dissolution of red blood cells.

1895–1900; hemo- + lysin

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World English Dictionary
haemolysin or (US) hemolysin (ˌhiːməʊˈlaɪsɪn, ˌhɛməʊ-, hɪˈmɒlɪsɪn, ˌhiːməʊˈlaɪsɪn, ˌhɛməʊ-, hɪˈmɒlɪsɪn)
biochem any substance, esp an antibody, that causes the breakdown of red blood cells
hemolysin or (US) hemolysin

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American Heritage
Medical Dictionary

hemolysin he·mol·y·sin (hĭ-mŏl'ĭ-sĭn, hē'mə-lī'-)
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.

The American Heritage® Stedman's Medical Dictionary
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Example sentences for hemolysin
They produce a hemolysin and an st enterotoxin similar to that of etec.
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