4 strokes · 8 jōyō kanji
The radical is highlighted in color in each kanji.
欠 is the “lack” radical — Kangxi radical #76, 4 strokes. It appears in 8 of the 2,136 jōyō kanji, listed below from the simplest to the most complex with the radical highlighted in color in each one.
Components found in these kanji — tap one to keep only the kanji that contain it (highlighted in blue).