窾

Han character

 * 1) hole
 * 2) hollow
 * 3) empty

Etymology
According to STEDT &, from.
 * Inside Chinese, cognate with "to go through, to pierce";
 * Outside Chinese, cognate with 🇨🇬, 🇨🇬 ~, 🇨🇬 (however, see there for alternative etymologies), etc.

Definitions

 * 1)   hole; crack
 * 2)  hollow; empty
 * 1)  hollow; empty