a despatch boat

An extra  boat  also provides the pronunciation

Components
舟 meaning component

  Meaning component

zhōu

  

boat

余 meaning component

  Meaning component

  

I

Evolution

艅 Seal script Shuowen (~100 AD)

Seal script

Shuowen (~100 AD)
艅 Regular script Modern

Regular script

Modern
Definitions

 

a despatch boat