a group of Gram-negative pink to purplish-brown bacteria, comprising the purple sulfur bacteria and purple nonsulfur bacteria, that occur in anaerobic aquatic environments and carry out a unique form of photosynthesis without oxygen, using the pigment bacteriochlorophyll.
noun 1. .
- Purple book
1. The “System V Interface Definition”. The covers of the first editions were an amazingly nauseating shade of off-lavender. 2. The Wizard Book. See also book titles. [Jargon File]
noun 1. See under (def 1). [chohk-ber-ee, -buh-ree] /ˈtʃoʊkˌbɛr i, -bə ri/ noun, plural chokeberries. 1. the berrylike fruit of any North American shrub of the genus Aronia, of the rose family, especially A. arbutifolia (red chokeberry) A. melanocarpa (black chokeberry) or A. prunifolia (purple chokeberry) 2. the plant that bears this fruit. /ˈtʃəʊkbərɪ; -brɪ/ […]
- Purple emperor
noun 1. any of several Old World nymphalid butterflies of the genus Apatura, esp A. iris, having mottled purple-and-brown wings