氐

dī 根本、底部；在合体字中多作声符，读 dī

部件是构形单位 —— 和检字用的部首、表音的声符都不是一回事。 · 5画

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.