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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)

fluoroscopy
nounLow
/flʊəˈrɒskəpi/A medical imaging technique that uses X‑rays to produce real‑time moving images of the internal structures of a patient.
fluorosis
nounLow
/flʊəˈrəʊsɪs/A chronic condition caused by excessive intake of fluorine compounds, characterized by discoloration and pitting of tooth enamel.
fluorouracil
nounC2
/ˌflʊərəʊˈjʊərəsɪl/A chemotherapy medication used to treat various cancers, functioning as an antimetabolite that disrupts DNA and RNA synthesis in rapidly dividing cells.
fluorspar
nounRare
/ˈfluːəˌspɑː/A mineral primarily composed of calcium fluoride (CaF₂), used as a flux in steelmaking and aluminium production, and as a source of fluorine.
fluosilicate
nounVery Low
/ˌfluːə(ʊ)ˈsɪlɪkeɪt/A salt or ester of fluosilicic acid, containing the anion SiF₆²⁻.
fluosilicic acid
nounC2/Technical
/ˌfluːə(ʊ)sɪˈlɪsɪk ˈæsɪd/A strong inorganic acid with the chemical formula H₂SiF₆, formed by the reaction of silica with hydrofluoric acid.
fluoxetine
nounLow (Technical/Medical)
/fluːˈɒksətiːn/An SSRI antidepressant medication used to treat depression, obsessive-compulsive disorder, panic disorder, and bulimia nervosa.
fluoxetine hydrochloride
nounLow (Specialized/Technical)
/fluːˈɒksətiːn ˌhaɪdrə(ʊ)ˈklɔːraɪd/The pharmaceutical salt form of fluoxetine, a selective serotonin reuptake inhibitor (SSRI) antidepressant.
fluphenazine
nounVery Low / C2+
/fluːˈfɛnəziːn/An antipsychotic medication belonging to the phenothiazine class, used to treat psychiatric disorders.
flurazepam
nounC2
/ˌflʊərəˈzɛpæm/A long-acting benzodiazepine derivative used primarily as a sedative-hypnotic to treat insomnia.
flurry
nounverbverb-intransitive+1B2
/ˈflʌr.i/A sudden, brief period of commotion, activity, or precipitation.
flush
adjectiveadverbnoun+3B2
/flʌʃ/To cause water to flow through or over something to clean it; to become red in the face; to be level or even with a surface.
flush girt
nounC2
/ˈflʌʃ ˈɡɜːt/A detail in carpentry and timber framing: a horizontal timber (girt) whose end is flush with the outer surface of a post or stud.
flush left
nounC1
/ˌflʌʃ ˈleft/A text formatting style where the text is aligned to the left margin, creating a straight left edge and an irregular right edge (ragged right).
flushed
adjectiveverbB2
/flʌʃt/Having a red or warm face, especially as a result of strong emotion, heat, illness, or exertion.
flushing
nounB2
/ˈflʌʃɪŋ/The action of causing something to flow or rush with water or liquid; becoming or making something become red in the face.
flushometer
nounVery Low
/ˈflʌʃɒmɪtə/A specialized valve device for controlling the water flow in high-pressure flush toilets, commonly found in public or commercial restrooms, that does not use a tank.
flushwork
nounVery Rare / Obscure
/ˈflʌʃwɜːk/A decorative masonry technique in which flint or stone is set within recessed mortar panels to create contrasting patterns on a wall surface.
fluster
nounverbverb-intransitive+1C1
/ˈflʌstə(r)/To make someone agitated, nervous, or confused, often causing them to act in a rushed or clumsy manner.
flustered
adjectiveverbB2
/ˈflʌstəd/Agitated, nervous, or confused, typically as a result of being rushed, embarrassed, or feeling pressure.

Showing 3301–3320 of 5868 words.