Examples: cartography card archaeology archetype monarchy legal loyal purse personal cinema kinase car carpenter hippopotamus Mesopotamia dative data date
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Ancient Greek -τρον
← Proto-Hellenic *-tron (inherited)
← Proto-Indo-European *-trom (inherited)

→ English klystron (mention)
→ English -tron (derived)
→ Ancient Greek μέτρον (affix)
→ Ancient Greek θέατρον (affix)
→ Ancient Greek κέντρον (affix)
→ Ancient Greek φίλτρον (affix)
→ Ancient Greek σκῆπτρον (affix)
→ Ancient Greek ἄγκιστρον (affix)
→ Ancient Greek κάτοπτρον (affix)
→ Ancient Greek λέκτρον (affix)
→ Ancient Greek πλῆκτρον (affix)
→ Ancient Greek κίνητρον (affix)
→ Ancient Greek σεῖστρον (affix)
→ Ancient Greek πλάστρον (affix)
→ Ancient Greek τέρετρον (affix)
→ Ancient Greek στέγαστρον (affix)
→ Ancient Greek λίστρον (mention)
→ Ancient Greek νῆτρον (affix)
→ Ancient Greek σῶστρα (affix)
→ Ancient Greek θύρετρα (affix)
→ Georgian ციკლოტრონი (mention)
→ Latin philtrum (affix)
→ Norwegian Bokmål teater (mention)
→ Norwegian Bokmål absurdteater (mention)