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Deaconess is a female deacon.
Both Deaconess, or Deacon is acceptable
The plural form of the noun deaconess is deaconesses.
The plural possessive form is deaconesses'.
Example: The deaconesses' daughters are in the choir.
Olympias the Deaconess was born in 368.
Deaconess Hospital was created in 1900.