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English Words Starting With F

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Noun Verb Adjective Adverb Plural noun Combining form Verb (transitive)Verb (intransitive)Verb (ambitransitive)

flu
nounHigh
/fluː/A common infectious viral illness causing fever, aching muscles, and respiratory symptoms.
flub
nounverbverb-ambitransitiveC2 (Low frequency)
/flʌb/To make a clumsy or embarrassing mistake, especially when performing a task.
flubdub
nounLow
/ˈflʌbdʌb/Pompous or pretentious nonsense; empty, foolish speech or show.
fluctuate
verbverb-intransitiveverb-transitiveC1
/ˈflʌk.tʃu.eɪt/to change or vary frequently and irregularly; to rise and fall in a continuous, unpredictable way.
fluctuation
nounC1
/ˌflʌk.tʃuˈeɪ.ʃən/A change or variation that is irregular, unpredictable, or moves up and down.
flucytosine
nounVery Low
/fluːˈsʌɪtəsiːn/An antifungal medication used primarily to treat serious fungal infections, often caused by Candida or Cryptococcus.
flue
nounB2
/fluː/A pipe, tube, or duct for carrying smoke, gas, or hot air from a fireplace, furnace, boiler, or other heating appliance to the outdoors.
flue gas
nounC1
/ˈfluː ˌɡæs/The mixture of gases exiting a chimney, flue, or exhaust system after a combustion process, typically containing nitrogen, carbon dioxide, water vapour, and pollutants.
flue pipe
nounC1
/ˈfluː ˌpaɪp/A metal pipe that channels smoke, gases, or hot air from a furnace, boiler, fireplace, or stove to the outside atmosphere.
flue stop
nounC2
/ˈfluː ˌstɒp/An organ stop that controls a set of pipes where sound is produced by air passing through a flue, producing a flute-like tone.
flue-cure
verbverb-transitiveC2
/ˈfluː ˌkjʊə/To cure tobacco, typically in a barn, by using heat from flues (pipes) to circulate warm air rather than direct exposure to smoke.
fluellen
nounLow (Specialist/Botanical/Dialect)
/fluːˈɛlən/A common name for several species of small, flowering plants in the genus Kickxia (formerly Linaria), particularly the round-leaved fluellen (Kickxia spuria) and the sharp-leaved fluellen (Kickxia elatine). They are annual weeds with snapdragon-like flowers, found in arable land.
fluerics
nounVery Low
/flʊˈɛr.ɪks/A branch of engineering and technology concerned with the control and movement of fluids (especially gases) in circuits, analogous to electronics.
fluff
nounverbverb-intransitive+1B2
/flʌf/Soft, light, loose material such as small fibres from wool, cotton, or fabric.
fluffer
nounLow
/ˈflʌfə/A person whose job is to keep things fluffy or maintain fluffiness, originally in film/TV production contexts.
flugelhorn
nounC2 / Low
/ˈfluːɡ(ə)lhɔːn/A valved brass wind instrument resembling a cornet but with a wider, conical bore and a broader, mellower tone.
flugelman
nounC2/Rare
/ˈfluːɡəlmən/A leader or guide; someone who sets an example or shows the way, often in a military, political, or organizational context. Historically, a soldier placed in front of troops to mark time or direction.
fluid
adjectivenounB2
/ˈfluːɪd/A substance that flows and yields to pressure; not rigid or solid.
fluid coupling
nounLow
/ˈfluːɪd ˈkʌplɪŋ/A mechanical device that transmits rotational power between two shafts using a fluid, typically oil, as the coupling medium.
fluid dram
nounVery low
/ˌfluː.ɪd ˈdræm/A unit of liquid volume in the imperial and US customary systems, equal to 1/8 of a fluid ounce or approximately 3.6967 millilitres in the US and 1/8 of a fluid ounce or approximately 3.5516 millilitres in the UK imperial system.

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