- any large, brown, cold-water seaweed of the family Laminariaceae, used as food and in various manufacturing processes.
- a bed or mass of such seaweeds.
- the ash of these seaweeds.
- to burn these seaweeds for their ash.
- any large brown seaweed, esp any in the order Laminariales
- the ash of such seaweed, used as a source of iodine and potash
