名詞 kelp:

1. large brown seaweeds having fluted leathery fronds

kelp

n.（名詞）
Any of various brown, often very large seaweeds of the order Laminariales.
巨藻：昆布目植物，有深淺各種褐色，通常是大型海草中的一種
The ash of these seaweeds, used as a source of potash and iodine.
海草灰：這種海草的灰常作為提煉鉀和碘的原料

來源：
Middle English culp
中古英語 culp