柢

• Literal: The root of a tree or plant; specifically the base or the deepest point where the plant meets the earth.
• Physical: The bottom or lowest part of an object.
• Abstract: The foundation, fundamental basis, or causal origin of a matter or argument.

Primarily functions as a noun. It can serve as a predicate (e.g., "X is the root/basis") or act as an attributive modifier to indicate that something is "fundamental" or "bottom-most."

• vs. 根 (gēn): While both mean root, 柢 often emphasizes the base or the singular point of anchorage, whereas 根 more frequently refers to the root system as a whole.
• vs. 基 (jī): 基 typically denotes an intentional architectural foundation (such as a pedestal), whereas 柢 denotes an organic or inherent base.
• vs. 底 (dǐ): 底 is the general term for the bottom of a container or space; 柢 specifically implies that which supports something growing or extending upward.

A botanical specialization of 氐 (bottom/base). In early texts, these may be used interchangeably.

The presence of the 木 (wood) radical explicitly signals "rootedness" or biological anchoring.