- A branch of the Indo-European languages that was spread widely over western and central Europe in the pre-Christian era.
- Of the Celts; Of the style of the Celts
Etymology: From Ancient Greek (Keltikos) "of or related to the Celts".
- Dutch: Keltisch
- French: celtique , celte
- German: keltisch
- Italian: celtico , celtica
- Spanish: céltico , céltica
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