seaweed used in salt-making; anthology
Historical term: originally a type of seaweed used in traditional salt production. Also used as a poetic name for an anthology, especially in classical contexts.
Moshiogusa is a type of seaweed that was used in the past to make salt.
The word 'moshiogusa' is also sometimes used as the name of a waka anthology.
Compound of 藻 (mo, 'seaweed') + 塩 (shio, 'salt') + 草 (kusa, 'grass, plant'). The exact historical derivation is uncertain, but the term refers to seaweed historically used in salt production.