noun
eelgrass; Zostera marina
A marine flowering plant found in shallow coastal waters; the scientific name is Zostera marina.
アマモは浅い海に生える海草です。
Eelgrass is a seagrass that grows in shallow seas.
この湾ではアマモの群落が広がっている。
In this bay, eelgrass beds are spreading.
The name likely derives from 甘い (amai, 'sweet') + 藻 (mo, 'algae/seaweed'), but the exact origin is uncertain.