Pronunciation: (prō"pē-on'u-bak-tēr'ē-um, -ō'nu-), [key]
—pl. -te•ri•aPronunciation: (-tēr'ē-u). [key] Bacteriol.
any of several aerobic or anaerobic bacteria of the genus Propionibacterium, found in dairy products, esp. hard cheeses where certain species are associated with the ripening process.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.