From Longman Dictionary of Contemporary Englishturniptur‧nip /ˈtɜːnɪp $ ˈtɜːr-/ noun [countable, uncountable] 
DFHBPa large round pale yellow vegetable that grows under the ground, or the plant that produces it
DFHBPa large round pale yellow vegetable that grows under the ground, or the plant that produces itExamples from the Corpus
turnip• The only other forage crops grown were kale and turnips but these were not widespread.• By that sorcery, both turnips and lives are converted to money.• Add mushrooms, carrot, turnip, and celery, and cook for 1 minute.• By the time she got back, Spike had whittled his turnip just right.• Five feet six, he was overweight for his height and his body resembled a large turnip in shape.• The goats: They take advantage of an opportunity like a field of turnips.• The goats just ran around and nibbled on the turnips.• When old Aaron Tyson from Limestone Hill sold to the greengrocer's the turnips he'd stacked up for his sheep.Origin turnip (1500-1600) Probably from turn (because of its rounded root) + neep “turnip” ((11-21 centuries)) (from Old English næp) 