monitress

[mon-i-tris]
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noun

a female student who helps keep order or assists a teacher in school.
a girl or woman who admonishes, especially with reference to conduct.

Origin of monitress

First recorded in 1740–50; monit(o)r + -ess

Usage note

See -ess.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for monitress

Historical Examples of monitress