氐

dī base; foundation (used mainly as a sound component)

Component (a building block) — not the same thing as a radical or a sound component. · 5strokes

氐 free — Standalone form; rare as an independent word in modern Chinese.
氐 right — Written on the right as the sound component of characters such as 抵.
氐 bottom — Written under a top element as the sound component of characters such as 低 and 底.