Definition of prill in US English:



  • A pellet or solid globule of a substance formed by the congealing of a liquid during an industrial process.

    • ‘The prill is then weighed, flattened out and rolled until very thin, and then placed in nitric acid, which dissolves away or parts the silver.’
    • ‘They can use this on-site to mix the fuel oil with the ammonium nitrate prill,’ Adama says.’
    droplet, drop, dewdrop, bead, tear, ball, bubble, pearl, particle
    View synonyms


Late 18th century (as a term in copper mining, denoting rich copper ore remaining after removal of low-grade material): of unknown origin.