prill noun¹. [prɪl] Now dial. E17.
[Metath. alt. of PURL noun².]
A small stream of running water; a rill.

[TahlilGaran] English Dictionary ▲

prill noun². [prɪl] L18.
[Origin unkn.]
1. In copper-mining, (a piece of) rich copper ore remaining after separation and removal of low-grade material. L18.

2. A granule or globule, orig. spec. of metal obtained by assaying a specimen of ore in the cupel. US. M19.

■ prilled adjective made into granules by solidifying molten droplets M20.

[TahlilGaran] English Dictionary ▲