A part
拡
Shown as a part of 2 words so far, read one way.
かく 2 words
- 拡張かくちょうexpansion, extension
拡張 · here “expand”
- 拡大かくだいmagnification, enlargement
拡大 · here “expand”
Also written with 拡
These words contain the character in their spelling but show no breakdown that names it, so nothing is claimed about its role in them.