WordGarden.iopolyunsaturated
C2Pronunciation
UK
- /pˌɒlɪˈʌnsətʃərˌeɪtɪd/
US
Meanings
Adjective
containing multiple carbon-carbon double bonds, especially describing a type of dietary fat or oil
Beyond the definition
Imagine fat molecules like little chains. Saturated fats have straight chains that pack tightly together, so they are often solid—think butter. This kind is different. "Poly" means many, and these fats have many double bonds in their chains. Those double bonds create bends, so these fats are usually liquid at room temperature—like sunflower oil or corn oil.
This is not just a chemistry term. This kind of fat is common in vegetable oils, nuts, seeds, and fatty fish. Omega-3 and omega-6 fatty acids belong to this group, and some of them are essential, which means the body must get them from food. So when you eat salmon, walnuts, or seeds, you are often getting this kind of fat.
The term "polyunsaturated" describes a type of fat molecule found in many foods. All fats are made up of carbon atoms linked together in chains, but the key difference lies in how those carbons connect. Saturated fats have only single bonds between their carbon atoms, making them solid at room temperature. Monounsaturated fats have one double bond, creating a slight bend in the chain. But polyunsaturated fats take it further—they contain multiple double bonds!
These double bonds create kinks and bends in the fat molecule's structure, preventing the molecules from packing tightly together. That is why they are usually liquid at room temperature. Common sources include vegetable oils such as sunflower, corn, and soybean oil, as well as fatty fish like salmon, tuna, and mackerel, along with nuts and seeds.
The term "polyunsaturated" comes from the prefix "poly," meaning many, combined with "unsaturated," referring to the presence of those double bonds. Some polyunsaturated fatty acids are essential, meaning our bodies cannot make enough of them and must get them from food. These fats are involved in important body functions, including cell growth and brain health.
Two important types of polyunsaturated fats are omega-3 and omega-6 fatty acids. You will often see the word in nutrition, food labels, and health writing. So, while "polyunsaturated" may sound like a complicated chemistry term, it simply describes fats with many double bonds, often found in oils, fish, nuts, and seeds.
Examples
- 1
Food sources
Salmon, walnuts, and sunflower oil are common sources of polyunsaturated fat.
- 2
Nutrition label
The label says the spread is high in polyunsaturated fats and low in saturated fat.
- 3
Nutrition science
Nutritionists often talk about omega-3 and omega-6 as types of polyunsaturated fatty acids.
- 4
Cooking choice
She replaced butter with a polyunsaturated vegetable oil for everyday cooking.
See also
Similar
Shades of meaning
- polyenoic
- highly unsaturated
Contrast
Used with (collocations)
- polyunsaturated fat
- polyunsaturated fatty acid
- polyunsaturated oil
Word family
- polyunsaturate
Explore
- fatty acid
- omega-3 fatty acid
Forms and spellings
1 form open this card.
Main spelling
- polyunsaturatedadjective