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English Words Starting With F

5,868 entries — pick a word to see its definition, pronunciation, and usage.

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

fluid drive
nounC2
/ˈfluːɪd draɪv/A type of automatic transmission system in vehicles, using a fluid coupling instead of a friction clutch to transfer power from the engine to the transmission.
fluid dynamics
nounC2
/ˌfluːɪd daɪˈnæmɪks/The branch of physics that studies the motion and behavior of liquids and gases, including forces and energy.
fluid intelligence
nounLow
/ˌfluːɪd ɪnˈtɛlɪdʒ(ə)ns/The capacity to think logically, solve novel problems, identify patterns, and adapt to new situations using reasoning, independent of acquired knowledge.
fluid lubrication
nounLow
/ˈfluːɪd ˌluːbrɪˈkeɪʃən/A lubrication regime where two sliding surfaces are completely separated by a layer of liquid (oil, grease, water, etc.), preventing direct contact and significantly reducing friction and wear.
fluid mechanics
nounC1+
/ˌfluː.ɪd məˈkæn.ɪks/The branch of physics and engineering that studies the behavior of fluids (liquids and gases) at rest and in motion, and the forces acting on them.
fluid ounce
nounC1
/ˌfluːɪd ˈaʊns/A unit of volume for measuring liquids, equal to 1/16 of a pint in the US customary system or 1/20 of an imperial pint in the British imperial system.
fluid pressure
nounC2
/ˈfluː.ɪd ˈpreʃ.ər/The force per unit area exerted by a fluid (liquid or gas) at rest on the walls of its container or on an immersed body.
fluidextract
nounVery Low
/ˈfluːɪdˌɛkstrækt/A liquid preparation of a vegetable drug made by percolation and evaporation, containing the active principles in concentrated form.
fluidics
nounVery low (Specialised technical term)
/fluːˈɪd.ɪks/The technology and engineering discipline concerned with the control, movement, and application of liquids or gases (fluids) under pressure in channels, valves, and other devices, often for amplification, switching, or sensing, analogous to electronics.
fluidity
nounC1
/fluːˈɪdɪti/The quality of being able to flow easily, or the quality of being able to change or adapt smoothly.
fluidize
verbverb-intransitiveverb-transitiveRare
/ˈfluːɪdaɪz/to make something flow like a fluid, especially by suspending solid particles in a gas.
fluidized bed
nounC2
/ˈfluːɪdaɪzd bɛd/A bed of solid particles (like sand or catalyst) made to behave like a fluid by passing a gas or liquid upward through it at a specific velocity.
fluke
nounB2
/fluːk/A surprising and unlikely piece of good luck or chance.
flumadiddle
nounExtremely Rare / Archaic
/ˌfluːməˈdɪd(ə)l/Nonsense; foolish talk or ideas; trivial or worthless matter.
flume
nounverbverb-transitiveLow
/fluːm/A narrow artificial channel or pipe for carrying water, typically for conveying wood or logs, industrial use, or as a water ride.
flummery
nounLow
/ˈflʌməri/Foolish or meaningless talk or ideas; nonsense.
flummox
verbverb-transitiveC1
/ˈflʌməks/To completely confuse or perplex someone.
flummoxed
adjectiveverbLow
/ˈflʌməkst/Completely bewildered, confused, or perplexed.
flump
nounverb-ambitransitiveC1 - Very Low
/flʌmp/To fall or sit down heavily and with a soft, dull sound.
flung
verbMedium (common for the verb form but less frequent than base synonyms like 'threw').
/flʌŋ/The past tense and past participle of 'fling,' meaning to throw or hurl something with force or sudden motion, often with a sense of recklessness, abandon, or strong emotion.

Showing 3241–3260 of 5868 words.