starch
Word family
Synonym discussion
Sense: noun/1
Starch refers specifically to the white carbohydrate stored in plants such as potatoes, rice, and corn. Carbohydrate is a much broader category that includes sugars, fibres, and starches — all carbohydrates are not starch, but all starches are carbohydrates. Flour is ground grain that contains starch, but it also includes protein (gluten), fibre, and other components; you can use flour to thicken a sauce, but the thickening power comes from its starch content. In everyday speech, people say 'cut back on starch' when following a low-carb diet, whereas a baker buys flour (not just starch) to make bread. For scientific accuracy on food labels, 'carbohydrate' is the formal term and 'starch' is one sub-type listed underneath.
Common collocations
Etymology
The word 'starch' comes from Old English 'stercan' meaning 'to stiffen' or 'make rigid', which is related to the adjective 'stark'. By the 15th century, it was being used as a noun for the substance used to stiffen cloth. The food sense developed naturally from the same substance in plants. The root goes back through Germanic languages to an Indo-European base meaning 'stiff' or 'rigid', which is also the source of the English word 'stark'.