
1) Agricultural chemical 2) Beadlike pellet 3) Pelletize 4) Rich copper ore
Found on
https://www.crosswordclues.com/clue/prill

A prill is a small aggregate or globule of a material, most often a dry sphere, formed from a melted liquid. Prilled is a term used in mining and manufacturing to refer to product that has been pelletized. The pellets are a neater, simpler form for handling, with reduced dust. The material to be prilled must be a solid at room temperature and a lo...
Found on
http://en.wikipedia.org/wiki/Prill

nodule of metal obtained after assaying
Found on
http://phrontistery.info/p.html

• (n.) A stream. • (n.) A nugget of virgin metal. • (n.) The brill. • (v. i.) To flow. • (n.) The button of metal from an assay. • (n.) Ore selected for excellence.
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http://thinkexist.com/dictionary/meaning/prill/

(from the article `explosive`) ANFO applications were based on prilled rather than crystallized ammonium nitrate. Prills, or free-flowing pellets, were developed for the fertilizer ... ...efforts toward reduced loading time have tended to replace dynamite with a free-running blasting agent, such as a mixture of ammonium nitrate and ... ...
Found on
http://www.britannica.com/eb/a-z/p/112
Prill intransitive verb To flow. [ Obsolete]
Stow. Found on
http://www.encyclo.co.uk/webster/P/160
Prill noun [ Confer
Brill .]
(Zoology) The brill.
Found on
http://www.encyclo.co.uk/webster/P/160
Prill noun A stream. [ Obsolete]
Davies (Microcosmos). Found on
http://www.encyclo.co.uk/webster/P/161
No exact match found.