trope
trope \'tro-p\ n [L tropus, fr. Gk tropos turn, way, manner, style, trope, fr. tr]epein to turn; akin to L trepit he turns 1: the use of a word or expression in a figurative sense : FIGURE OF S PEECH 2: a phrase or verse added as an embellishment or interpolation to the sung parts of the mass in the medieval period