chorister

[kawr-uh-ster, kor-] /ˈkɔr ə stər, ˈkɒr-/
noun
1.
a singer in a choir.
2.
a choirboy.
3.
a choir leader.
Origin
1325-75; < Medieval Latin chorist(a) singer in a choir + -er1; replacing Middle English queristre < Anglo-French, equivalent to quer choir + -istre -ist
British Dictionary definitions for chorister

chorister

/ˈkɒrɪstə/
noun
1.
a singer in a choir, esp a choirboy
Word Origin
C14: from Medieval Latin chorista
Word Origin and History for chorister
n.

"member of a choir," mid-14c., queristre, from Anglo-French cueriste, French choriste, from Church Latin chorista, from Latin chorus (see chorus) + -ster. Modern form is from late 16c.