white potato

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun The edible tuber of the common cultivated potato, usually having white or yellow flesh.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun an edible tuber native to South America; a staple food of Ireland
• noun annual native to South America having underground stolons bearing edible starchy tubers; widely cultivated as a garden vegetable; vines are poisonous