pneu·mo·coc·cus 
(n′mə-kŏkəs, ny′-)
(n′mə-kŏkəs, ny′-)n. pl. pneu·mo·coc·ci (-kŏksī′, -kŏkī′)
A nonmotile, gram-positive bacterium (Streptococcus pneumoniae) that is the most common cause of bacterial pneumonia and is a cause of meningitis and other infectious diseases.
pneu′mo·coccal (-kŏkəl) adj.
- on the same wavelength
- on-the-scene
- on the shelf
- on the side
- on the sly
- on the spectrum
- on the spot
- on the square
- on the street
- on the strength of
- on the string
- on the surface
- on the table
- on the take
- on the tapis
- on the tip of (one's) tongue
- on the tip of one's tongue
- on the tip of tongue
- on the town
- on the up and up
- on the up-and-up and up
- on the up-and-up/up and up
- on the upgrade
- on the wagon
- on the wane