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