noun
dwarf eelgrass; Japanese eelgrass
A species of seagrass (Nanozostera japonica) native to Japanese coastal waters.
コアマモは浅い海に生える海草の一種です。
Dwarf eelgrass is a type of seagrass that grows in shallow seas.
The name likely derives from 小 (ko, 'small') + 甘藻 (amamo, 'eelgrass'), referring to its smaller size compared to common eelgrass. The exact origin is uncertain.