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poly·ri·bo·syl·ri·bi·tol phosphate | \ ˌpäl-i-ˌrī-bə-sil-ˌrī-bə-ˌtȯl-, -ˌtōl- 
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\Medical Definition of polyribosylribitol phosphate
: a polysaccharide of the capsule of the Hib bacterium that exhibits activity against phagocytes — see conjugate vaccine
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