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opt out
opt-out
optative
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opsonic index

op·son·ic in·dex (plural op·son·ic in·dex·es or op·son·ic in·di·ces)


noun 
Definition:
 
measurement of destroyed bacteria: a measure of the number of bacteria destroyed by blood cells, expressed as the ratio of opsonin in the infected patient's blood to the amount found in a healthy person's blood

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