Source : Webster's Revised Unabridged Dictionary (1913)

Acroteleutic \Ac`ro*te*leu"tic\
   ([a^]k`r[-o]*t[-e]*l[=u]"t[i^]k), n. [Gr. 'a`kros extreme +
   teley`th end.] (Eccles.)
   The end of a verse or psalm, or something added thereto, to
   be sung by the people, by way of a response.