/ ˈkɒrɪstə(r); NAmE ˈkɔːr-/ noun
a person, especially a boy, who sings in the choir of a church
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WORD ORIGIN
late Middle English queristre , from an Anglo-Norman French variant of Old French cueriste , from quer (from Latin chorus ). The change in the first syllable in the 16th cent. was due to association with obsolete chorist member of a choir or chorus , from Old French choriste , from Latin chorus , but the older form quirister long survived.