A device, tool, or person that frosts or applies frosting, or something that causes frost or freezing.
Formed by adding the agent suffix '-er' to the verb 'frost.' This creates a noun meaning either something that performs the action (a frosting device) or causes the condition (extreme cold).
A 'froster' could be a baker's tool, a refrigeration device, or even poetically the winter weather itself—the suffix '-er' is so powerful in English that it lets us transform almost any action into 'someone or something that does it.'
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