Origin

The character 根 combines the tree radical 木 on the left, which signals the meaning has to do with plants, with 艮 on the right, which serves as a sound hint for how the character is pronounced. Since roots are the underground part of a tree that anchors it in place, the tree component makes sense for this meaning. The right side 艮 doesn't contribute a meaning of its own but tells you roughly how to say the word in Chinese-derived pronunciation. Over time, the character's meaning expanded beyond just plant roots to include the concept of a foundation or base in general, and eventually the slang meaning of a pimple's head or core.

AI-generated (claude-haiku-4-5), not yet reviewed. Formation type (automated guess): Phono-semantic (meaning + sound hint).