マツモ

noun

common hornwort; Ceratophyllum demersum

A submerged aquatic plant often used in aquariums and found in ponds and slow streams.

• 水すい槽そうにマツモを入いれると、水みずがきれいになる。

  If you put hornwort in the aquarium, the water becomes clean.

noun

Analipus japonicus; a brown alga

A species of brown alga found along Japanese coasts; less commonly encountered than the hornwort sense.

• この海かい岸がんでは、マツモという褐かっ藻そうが採とれる。

  On this coast, a brown alga called matsumo can be collected.