kelp
Concise Oxford English Dictionary © 2008 Oxford University Press:
kelp/kelp/
▶noun
- 1 a very large brown seaweed that typically has a long, tough stalk with a broad frond divided into strips. [Laminaria and other genera, family
Laminariaceae .]
- 2 the calcined ashes of seaweed, used as a source of various salts.
– origin ME: of unknown origin.
'kelp' also found in these Oxford entries:

