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Definition of kelp
- a large brown seaweed that typically has a long, tough stalk with a broad frond divided into strips. Some kinds grow to a very large size and form underwater “forests” that support a large population of animals.
- Family Laminariaceae, class Phaeophyceae, including the genera Laminaria (used in some areas as manure) and Macrocystis (harvested in the US as a source of algin)
late Middle English: of unknown origin