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[ usually singular ] ( history ) land that people are just beginning to live on, especially in the western U.S. in the 1800s

frontier towns of the Wild West —SYNONYM border

the frontiers [ plural ] the limit between what we know and what we do not know

the frontiers of modern medicine

frost / frost / noun [ count, noncount ]

ice, like white powder, that covers the ground when the

weather is very cold

There was a frost last night.

► frost • y / frosti / adjective

( frost • i • er, frost • i • est )

a frosty morning

frost • ing / ' frostig / noun [noncount]

a sweet substance that you use for covering cakes chocolate frosting

frown / fraun / verb ( frowns , frown • ing , frowned )

to show that you are angry or worried by making lines appear above your nose

John frowned at me when I came in. "You're late," he said. ►frown noun [ count ]

She looked at me with a frown.

froze

form of freeze

fro • zen 1

form of freeze

frO .Zen 2Ф/ frouzn/ adjective ( informal )

(used about food) kept at a very cold temperature so that it stays fresh for a long time

frozen peas

(used about water) turned to ice, or with a layer of ice on the top

a frozen lake

fruit Ф / frut / noun [ count, noncount ]

Pronunciation

The word fruit sounds like boot .

the part of a plant or tree that holds the seeds. Oranges and

apples are types of fruit

Would you like a a piece of fruit ?

"Would you like some fruit ?" "Yes please — I'll have a pear."

fruit sal • ad / |frut ' srebd / [ count, noncount ]

a sweet dish made of small pieces of different kinds of fruit

frus • trat • ed / ' frAstreitad / adjective

feeling angry because you cannot do what you want to do She felt frustrated by her lack of progress.

frus • trat • ing / ' frAstreitig / adjective

making you angry because you cannot do what you want to do

It's very frustrating when you can't say what you mean in a foreign language.

frus • tra • tion / frA 'streifn/ noun [ noncount ]

a feeling of anger because you cannot get or do something you want

He got stuck in traffic and hit the steering wheel in frustration.

fry ©/ frai / verb ( fries, fry ing, fried , has fried )

to cook something in hot fat or oil Fry the onions in butter. fried eggs Thesaurus

cook to make food ready to eat by heating it: My mother taught me how to cook. ♦ Who is going to cook dinner tonight? ♦ What's the best way to cook salmon? ♦ He cooked us a wonderful meal. boil to cook vegetables, rice, eggs, etc. in boiling water (= water heated to 212°F ) : Boil the rice for 15 minutes. ♦ Put the potatoes on to boil. ♦ Do you like boiled cabbage?