What's the difference between calefactor and calefactory?

Calefactor

Definition:

• (n.) A heater; one who, or that which, makes hot, as a stove, etc.

Example Sentences:

Calefactory

Definition:

• (a.) Making hot; producing or communicating heat.
• (n.) An apartment in a monastery, warmed and used as a sitting room.
• (n.) A hollow sphere of metal, filled with hot water, or a chafing dish, placed on the altar in cold weather for the priest to warm his hands with.

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