prill, n.1 A spinning top. prill, n.2 A small stream of running water; a rill.prill, n.3 A girl, a lass. prill, n.4 In mining: (a piece of) rich copper ore remaining after separation and removal of low-grade material; more fully prill ore. Also: (a droplet of) copper occurring suspended in the molten slag in the process of smelting copper ore. prill, v.1 intr. To flow, spurt. prill, v.2 App. a transmission error for rill thrill or prik, prike prick. prill, v.3 1. trans. Metall. To add high-grade ore to (an ore sample) during assaying, so as to give the impression that the ore being assayed is of a higher quality. Obs. rare. 2. trans. To produce pellets of (a substance, esp. ammonium nitrate or other fertilizer) by forming the molten substance into droplets and allowing them to solidify while falling. Thus, March End Prill is a songline periplum that charts a way through our S.A.D. Zeitgeist to a thawing of the sources of speech and song.