prill

noun /pɹɪl/

1. a pellet, a granule, a small bead

   Prills are free-flowing pellets developed for fertilizer as a coarse product with little setting tendency that can be spread easily and smoothly.

2. rich copper ore remaining after removal of low-grade material; a droplet of copper suspended in molten slag

3. A nugget of virgin metal.

4. The button of metal from an assay.

Where it comes from

Unknown. OED mentions Cornish pryl (“sheep-droppings”) as a likely loan from English.

Adapted from the Wiktionary entry prill (CC BY-SA 4.0).

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