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pl. algae [al′gə]
Etymology: L, seaweed
any of a large group of mostly photosynthetic protists, found worldwide in fresh water, in salt water, and on land. algal, adj.
Any seaweed (e.g., rockweed, sea lettuce, sea moss and freshwater form), which range in size from single-celled organisms to large vegetable masses measuring up to 200 m in length. Alga produce chemicals with potential anticarcinogenic and antimicrobial effects; clinical data on their efficacy is limited.