noun
astringent persimmon
Refers to a persimmon that is still astringent and inedible raw due to high tannin content; often contrasted with 甘柿 (sweet persimmon).
渋柿はそのままでは食べられないので、干し柿にします。
Astringent persimmons cannot be eaten as they are, so we make dried persimmons.
甘柿 is a sweet persimmon that can be eaten raw without astringency, while 渋柿 is astringent and must be processed (e.g., dried or treated) before eating.
Compound of 渋 (shibu, 'astringent') + 柿 (kaki, 'persimmon').