Definition of schoolmarm noun from the Oxford Advanced American Dictionary

 

schoolmarm

 noun
noun
NAmE//ˈskulmɑrm//
 
(disapproving)
 
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a woman who teaches in a school, especially one who is old-fashioned and strict
schoolmarmish
 
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NAmE//ˈskulˌmɑrmɪʃ//
 
adjective a schoolmarmish tone of voice
See the Oxford Advanced Learner's Dictionary entry: schoolmarm