different between polverine vs pulverine

English

Italian polverino, from Latin pulvis (“dust”).

polverine (countable and uncountable, plural polverines)

(uncountable) Glassmaker's ashes; a kind of potash or pearlash, brought from the Levant and Syria, used in the manufacture of fine glass.
(countable) A tiny biting insect found in South America.

polverine f

From Latin pulvis, pulveris (“dust, powder”). Compare French pulvérin.

pulverine (uncountable)

(dated) ashes of barilla
- 1839, Andrew Ure, A Dictionary of Arts, Manufactures, and Mines
  Immersion in water would be apt to wash the nitre out of the pulverine ; but this result would be prevented if the match or priming mixture were liquefied or brought to the pasty consistence , not with water , but spirit varnish.

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