(i-liz″ă-bĕth-king′ē-ă mĕ-ning″gō-sep′tĭ-kă) [Elizabeth O. King, 20th-cent. U.S. microbiologist] An aerobic, gram-negative, nonmotile, yellow rod-shaped bacterium found extensively in nature. It sometimes causes opportunistic infections in immunocompromised hosts.