Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
...
Portuguese eletro-

→ Portuguese eletromagnético (affix)
→ Portuguese eletroquímico (affix)
→ Portuguese eletroímã (affix)
→ Portuguese eletrostático (affix)
→ Portuguese eletrodoméstico (affix)