celeriac

noun
🔊/səˈleriæk/
🔊/səˈleriæk/
[uncountable]
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  1. a large white root vegetable that is a type of celery and that is eaten raw or cooked块根芹;根芹菜Topics Foodc2
    Word Originmid 18th cent.: from celery + an arbitrary use of -ac.