根ね

1. 1root (of a plant)
2. 2root (of a tooth, hair, etc.) ; center (of a pimple, etc.)
3. 3root (of all evil, etc.) ; source ; origin ; cause ; basis
4. 4one's true nature
5. 5(fishing) reef

JMdict entry 1290020 · frequency rank 5. Source and licence.