Acroteleutic

Ac′ro‐te‐leu″tic (ăk′rō̍‐tē̍‐lū″tĭk), n. [Gr. ἄκροσ extreme + τελεύτη end.] (Eccles.) The end of a verse or psalm, or something added thereto, to be sung by the people, by way of a response.