membrane lining inside of reed

Components

Meaning component
cao, cǎo grass

grass

Sound component
captive

Character Evolution

Seal form
Seal Shuowen ~100 AD
Regular Modern

Historical Pronunciations

Old Chinese
Zhengzhangbrowʔ
pʰuw

說文解字

艸也。从艸孚聲。

Sources

Readings & variants
Unicode
Historical pronunciations
Zhengzhang Shangfang
Historical images
Academia Sinica