The seed of a persimmon (the small seed you can plant to grow a persimmon tree).
庭に落ちていた柿の種を拾って植えてみた。
I picked up a persimmon seed that had fallen in the yard and tried planting it.
柿の種は発芽するまで時間がかかることが多い。
Persimmon seeds often take a long time to germinate.
小鳥が落ちていた柿の種をついばみ始めた。
A small bird began pecking at the fallen persimmon seed.
A crunchy crescent-shaped snack (made from baked or fried glutinous rice) often flavored spicy or with soy sauce; commonly sold mixed with peanuts (called 'Kaki-Pi').
ビールのおつまみに柿の種をよく買う。
I often buy kaki-no-tane as a snack with beer.
スーパーで柿の種（ピーナッツ入り）を二袋買った。
I bought two bags of kaki-no-tane (with peanuts) at the supermarket.
柿の種は辛口と醤油味など種類がある。
Kaki-no-tane comes in varieties such as spicy and soy-sauce flavors.
柿の種は『柿ピー』とも呼ばれて親しまれている。
Kaki-no-tane is familiarly known as 'Kaki-Pi'.