noun
gutweed; grass kelp
A type of edible green seaweed (Ulva intestinalis) with a tubular, grass-like shape. Used in Japanese cuisine, often dried and sprinkled over dishes.
ボウアオノリは味噌汁に入れると風味が増す。
Adding gutweed to miso soup enhances its flavor.
この辺りの海岸ではボウアオノリがよく採れる。
Gutweed is often harvested along the coast around here.
青海苔 is a general term for green laver (often Enteromorpha species), while ボウアオノリ specifically refers to the tubular gutweed (Ulva intestinalis).
From 棒 (bō, 'stick, rod') + 青海苔 (aonori, 'green laver'), referring to the plant's tubular, stick-like shape.