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Latin word Colosseum comes from Ancient Greek κολοσσός, and later Latin colosseus (Colossal, huge, gigantic.).

Colosseum etymology ?

Colosseum detailed word origin explanation

Dictionary entryLanguageDefinition
κολοσσός Ancient Greek (grc)
κολοσσιαῖος Ancient Greek (grc)
colosseus Latin (lat) Colossal, huge, gigantic.
Colosseum Latin (lat)