The Collaborative International Dictionary of English v.0.48:

Prill \Prill\, n.
   A stream. [Obs.] --Davies (Microcosmos).
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Prill \Prill\, n. [Cf. Brill.] (Zool.)
   The brill.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Prill \Prill\, v. i.
   To flow. [Obs.] --Stow.
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The Collaborative International Dictionary of English v.0.48:

Prill \Prill\, n. [Etymol. uncertain.]
   1. (Mining)
      (a) A nugget of virgin metal.
      (b) Ore selected for excellence.
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   2. The button of metal from an assay.
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The Collaborative International Dictionary of English v.0.48:

Brill \Brill\, n. [Cf. Corn. brilli mackerel, fr. brith
   streaked, speckled.] (Zool.)
   A fish allied to the turbot (Rhombus levis), much esteemed
   in England for food; -- called also bret, pearl, prill.
   See Bret.
   [1913 Webster]