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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)

flashcube
nounC2 / Rare
/ˈflaʃkjuːb/A small disposable plastic cube with four flashbulbs (one on each side), designed to be rotated after each use on a camera.
flashed glass
nounLow (Technical/Specialized)
/flæʃt ɡlɑːs/Glass made by coating a layer of one colour onto a base of another colour, typically through flashing a thin layer of coloured glass onto clear or differently coloured glass.
flasher
nounB2
/ˈflæʃ.ər/A person or device that produces a sudden, brief burst of light.
flashgun
nounC1
/ˈflæʃɡʌn/A device that produces a brief, intense flash of light to illuminate a subject for photography.
flashing
nounB2
/ˈflæʃɪŋ/A strip of impervious material used to prevent water penetration at the junction between a roof and a vertical surface (like a wall or chimney).
flashing point
nounC1
/ˈflæʃ.ɪŋ ˌpɔɪnt/The temperature at which a liquid gives off enough vapour to ignite in air when exposed to a flame.
flashlight
nounHigh
/ˈflæʃlaɪt/A small, portable, handheld electric light powered by batteries.
flashlight fish
nounRare/Very Low
/ˈflaʃlaɪt ˌfɪʃ/Any of several small marine fish, especially of the family Anomalopidae, that have bioluminescent organs under their eyes which they can flash on and off.
flashover
nounverb-intransitiveC2
/ˈflæʃˌəʊvə(r)/In fire science, the sudden and near-simultaneous ignition of all exposed combustible materials in an enclosed space, caused by the buildup of heat from a fire.
flashpacker
nounC1-C2
/ˈflæʃpækə/A traveler, typically in their 30s or older, who blends elements of backpacking with a higher budget and comfort, often using modern technology.
flashtube
nounRare
/ˈflaʃtjuːb/A high-intensity, short-duration light source, typically a glass or quartz tube filled with xenon or krypton gas, used for producing a bright flash of light.
flask
nounB2
/flɑːsk/A small, narrow-necked bottle, typically made of glass or metal, used for storing liquids.
flasket
nounRare/Obsolete
/ˈflɑːskɪt/A small, shallow basket, especially one used for holding flowers, fruit, or other delicate items.
flat
adjectiveadverbnoun+3High
/flat/A horizontal, level surface without significant curves, bumps, or inclines.
flat arch
nounC2
/ˌflat ˈɑːtʃ/An architectural arch with a level or nearly level curve, composed of bricks or stones laid with joints that radiate from a central point, transferring load vertically.
flat back
nounC1
/ˌflæt ˈbæk/A physical position or posture where the back is kept straight, without the natural spinal curves, often parallel to a surface.
flat bond
nounC1
/flæt bɒnd/A short-term, interest-free loan paid in advance by a tenant to a landlord, held as security against damage or unpaid rent. It is typically fully refundable if the rental property is returned in good condition.
flat bug
nounRare
/ˌflæt ˈbʌɡ/A true bug (Hemiptera) belonging to the family Aradidae, characterized by a very flattened body adapted for living under bark or in crevices.
flat cap
nounC1
/ˌflæt ˈkæp/A soft, rounded men's cap with a small stiff brim at the front.
flat character
nounC1/C2
/ˌflæt ˈkær.ək.tər/A simple literary character who lacks psychological depth, complexity, or development throughout a story.

Showing 2681–2700 of 5868 words.