No. A chalice is a type of cup; the phrase simply means a cup taht has been poisoned, and there is no oxymoron in it.
A goblet A chalice
The Communion is in a ciborium and the wine is in a chalice.
A goblet A chalice
chalice
The cup, the bowl and the node.
A chalice is a wine cup. It is used to symbolize the Disciples of Christ denomination and the Unitarian denomination.
the plate is called the paten and the cup is called the chalice
chalice
You may be looking for the word "chalice."
It is not, cup is the word that is used.
A cup or chalice