Translation guide
In Japanese, 'seaweed' is not a single everyday word. The most common edible seaweeds are nori, wakame, kombu, and hijiki. The general term 海藻 (かいそう) exists but is more scientific. For cooking and daily life, use the specific name.
海藻
What is the most common word for edible seaweed?
But it's more natural to use the specific name like のり, わかめ, etc.
Referring to seaweed as a food ingredient in general, without specifying the type.
General term for marine algae, used in cooking and nutrition contexts. Can sound slightly formal or scientific.
海藻はミネラルが豊富です。
Seaweed is rich in minerals.
Often used interchangeably with 海藻, but technically refers to seagrasses (flowering plants) rather than algae. In everyday use, the distinction is often blurred.
海草サラダを注文した。
I ordered a seaweed salad.
The thin, dried seaweed sheets used for sushi, onigiri, and as a topping.
The most common word for the dried seaweed sheets. Used in sushi, onigiri, and many other dishes.
おにぎりに海苔を巻く。
Wrap the rice ball with nori.
海苔はパリパリしている。
The nori is crispy.
The soft, green seaweed often found in miso soup and seaweed salads.
A specific type of edible seaweed, very common in Japanese cuisine. Often used in miso soup and salads.
味噌汁にわかめを入れる。
Put wakame in miso soup.
わかめサラダが好きです。
I like wakame salad.
The thick, dark seaweed used to make dashi broth.
The dark, stringy seaweed often simmered with vegetables.
A type of brown seaweed that is rehydrated and simmered, often with carrots and aburaage.
ひじきの煮物を作った。
I made simmered hijiki.
Referring to seaweed in its natural environment, not as food.
The general term for marine algae, appropriate for describing seaweed in nature.
海岸に海藻が打ち上げられていた。
Seaweed had washed up on the shore.
General term for algae or aquatic plants, can refer to seaweed in the ocean or freshwater algae.
岩に藻が生えている。
Seaweed is growing on the rocks.
When talking about food, Japanese speakers almost always use the specific name (nori, wakame, kombu, hijiki) rather than the general term 海藻. Using 海藻 in a restaurant might sound like you're talking about the nutritional concept of seaweed.
The literal translation '海の雑草' (sea weeds) is not used in Japanese. The word 海藻 is the correct general term.