antiphon
noun
[ ˈantɪf(ə)n ]
• (in traditional Western Christian liturgy) a short sentence sung or recited before or after a psalm or canticle.
Origin:
late Middle English: via ecclesiastical Latin from Greek antiphōna ‘harmonies’, neuter plural of antiphōnos ‘responsive’, from anti ‘in return’ + phōnē ‘sound’.