"celeriac" in the noun sense
1. celeriac, celery root, knob celery, root celery, turnip-rooted celery, Apium graveolens rapaceum
grown for its thickened edible aromatic root
2. celeriac, celery root
thickened edible aromatic root of a variety of celery plant
Source: WordNet® (An amazing lexical database of English)
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