|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
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pneumococcus pneu·mo·coc·cus (n&oomacr;'mə-kŏk'əs, ny&oomacr;'-)
n. pl. pneu·mo·coc·ci (-kŏk'sī', -kŏk'ī')
A nonmotile, gram-positive bacterium (Streptococcus pneumoniae) that is the most common cause of bacterial pneumonia and is associated with meningitis and other infectious diseases.