pneumococcus - pneumococcal /nooh meuh kok euhl, nyooh /, pneumococcic /nooh meuh kok sik, nyooh /, pneumococcous /nooh meuh kok euhs, nyooh /, adj. /nooh meuh kok euhs, nyooh /, n., pl. pneumococci / kok suy, see/. a bacterium, Diplococcus pneumoniae, causing... ... Universalium