*h₁pr‑o‑ / *h₁ep‑r‑
http://lila-erc.eu/data/lexicalResources/BrillEDL/id/etymon/pie0061 an entity of type: Etymon
Etymology for: aper (la0084)
*h₁pr‑o‑ (for Latin);*h₁ep‑r‑ (for Germanic)
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*h₁ep‑r‑
*h₁pr‑o‑