Where does “pearlstone” come from?

pearlstone (English) comes from English Pearl, from Middle English perle, from Old French perle, from Medieval Latin perla, from Latin perna, from Proto-Italic persnā, from Proto-Indo-European tpḗrsneh₂, from Proto-Indo-European sperH- — to kick.

pearlstone (English): perlite

Definitions

  1. perlite

Ancestry of “pearlstone”, step by step

pearlstone traces back through two separate lines of ancestry.

via English Pearl

StepLanguageWordMeaning
1EnglishPearlA placename
2Middle EnglishperleA pearl; Any round object, especially when shiny;...
3Old Frenchperle
4Medieval Latinperla
5LatinpernaA haunch or ham together with the leg, gammon; A...
6Proto-Italicpersnā
7Proto-Indo-Europeantpḗrsneh₂heel, upper thigh
8Proto-Indo-EuropeansperH-to kick

via English Stone

StepLanguageWordMeaning
1EnglishStonefor someone who lived near a stone worked with stone, from
2Middle EnglishstonAlternative form of stone
3Old Englishstānstone, rock
4Old NorseVeggrname of a dwarf
5Proto-Germanicwajjuzwall
6Proto-Indo-Europeanwh̥₁yús
7Proto-Indo-Europeanweh₁y-to twist, wind, weave, plait; to wrap, enclose,...
Every word from Proto-Indo-European sperH-Every word from Proto-Indo-European tpḗrsneh₂Every word from Proto-Italic persnā