from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A purple pigment similar to rhodopsin occurring in the cell membranes of bacteria of the genus Halobacterium that converts sunlight directly into chemical energy.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Any of several related purple photosynthetic proteins, found in halobacteria, that act as proton pumps.
Sorry, no etymologies found.