i Register
In some senses, coachwheel is marked as obsolete, slang, UK, historical. Watch for register when choosing this word.
noun
A cartwheel, the wheel of a horse-drawn coach
A crown coin; its value, 5 shillings.
Half-a-crown is known as an alderman, half a bull, half a tusheroon, and a madza caroon; whilst a crown piece, or five shillings, may be called either a bull, or a caroon, or a cartwheel, or a coachwheel, or a thick-un, or a tusheroon.