yam

American  

[yam] / jæm /

noun

yams plural

1. the starchy, tuberous root of any of various climbing vines of the genus Dioscorea, cultivated for food in warm regions.

2. any of these plants.

3. the sweet potato.

4. Scot. potato.

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yam British  

/ jæm /

noun

1. any of various twining plants of the genus Dioscorea, of tropical and subtropical regions, cultivated for their edible tubers: family Dioscoreaceae

2. the starchy tuber of any of these plants, which is eaten as a vegetable

3. any of certain large varieties of sweet potato

4. a former Scot name for the (common) potato

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Other Word Forms

Noun Inflected Forms

• yams
  plural

Etymology

Origin of yam

First recorded in 1580–90; compare Gullah nyam, Jamaican English nyaams, Sranan jamsi, from sources in one or more West African languages (compare Wolof nyam (nyam), Fulani nyami “to eat,” Twi εnãm “flesh”); earlier English forms, from Portuguese inhame or Spanish (i)ñame

Explanation

A yam is a starchy vegetable that grows underground. Yams are similar to potatoes — they can be baked, boiled, mashed, grated, or cut into chunks. In North America, a yam is the same thing as a sweet potato, although in most parts of the world these words refer to two completely different vegetables. Yams have flesh that ranges in color from white to deep orange and tastes slightly sweet. The word yam started as igname, from the Portuguese inhame, from a West African source.

Example Sentences

Vibrantly-coloured drinks made with ube, or purple yam, have also been added to Costa Coffee and Starbucks menus this summer, with marketing materials heavily promoting ube's lilac hues.

From BBC • May 8, 2026

She cited aspirin drawing on formulations using willow tree bark, contraceptive pills developed from yam plant roots and child cancer treatments based on Madagascar's rosy periwinkle flower.

From Barron's • Dec. 17, 2025

Mountain yam, bamboo pith and shoots, lotus seeds and gorgon fruit, which Yin says “looks like chickpeas, and tastes like tapioca,” all appear on his menu, too.

From The Wall Street Journal • Oct. 18, 2025

And at Chishuru, whose prix fixe dinner menu is priced at £95, egusi — a seed used in soup, usually served with pounded yam — flavors an ice cream accompanying a meringue sponge.

From New York Times • Nov. 20, 2024

The vegetables were overcooked, the cornmeal was too lumpy, the soup too watery, and the yam slices coarse from being boiled without a dollop of butter.

From "Half of a Yellow Sun" by Chimamanda Ngozi Adichie