| cyan | any organic compound in which the cyano radical -CN and the hydroxyl radical -OH are attached to the same carbon atom |
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| cyan | photosynthetic bacteria found in fresh and salt water, having chlorophyll a and phycobilins |
| cyan | prokaryotic organisms sometimes considered a class or phylum or subkingdom |
| cyan | relating to or caused by photosynthetic bacteria of the class Cyanobacteria |
| cyan | a bluish discoloration of the skin and mucous membranes |
| cyan | a white crystalline organic base |
| cyan | a trimer of cyanic acid |