Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Proto-Indo-European *h₂eydʰ-

→ English ether (root)
→ English ether (derived)
→ English edifice (root)
→ English anneal (derived)
→ English edify (root)
→ English aedile (root)
→ English aedicula (root)
→ English oast (root)
→ English oast (inherited)
→ English Etna (derived)
→ English adle (derived)
→ English cavaedium (root)
→ English Aetna (mention)
→ Old English al (root)
→ Old English al (mention)
→ Old English ælan (root)
→ Old English adl (derived)
→ Breton oaz (derived)
→ Greek Αίτνα (mention)
→ Persian هیزم (derived)
→ French été (derived)
→ Irish Aodh (root)
→ Irish aodh (derived)
→ Scottish Gaelic Aodh (root)
→ Ancient Greek αἴθω (derived)
→ Ancient Greek Αἴτνη (inherited)
→ Ancient Greek αἶθος (inherited)
→ Italian estate (root)
→ Italian estate (derived)
→ Italian etere (root)
→ Italian etere (mention)
→ Italian Etna (mention)
→ Italian eduo (derived)
→ Latin aestas (root)
→ Latin aestas (derived)
→ Latin aedis (root)
→ Latin aedis (mention)
→ Latin aestus (root)
→ Latin aestus (derived)
→ Latin estio (derived(la/pt))
→ Latin Aetna (mention)
→ Latin Aedui (derived)
→ Ligurian stæ (root)
→ Ligurian stæ (mention)
→ Old Norse eðla (derived)
→ Ossetian ирд (inherited)
→ Portuguese Etna (mention)
→ Sanskrit एध (mention)
→ Sanskrit इध् (inherited)
→ Sanskrit एधते (mention)
→ Sanskrit एधस् (mention)
→ Sanskrit एध् (root)
→ Sanskrit एध् (inherited)