| fusain | (noun) a stick of black carbon material used for drawing | Synonyms: charcoal |
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| fuscous | (adjective) of something having a dusky brownish grey color | Synonyms: taupe |
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| fuse | (noun) any igniter that is used to initiate the burning of a propellant | Synonyms: fusee, fuze, fuzee, primer, priming |
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| (noun) an electrical device that can interrupt the flow of electrical current when it is overloaded | Synonyms: electrical fuse, safety fuse |
| (verb) mix together different elements | Synonyms: blend, coalesce, combine, commingle, conflate, flux, immix, meld, merge, mix |
| (verb) make liquid or plastic by heating | - |
| (verb) become plastic or fluid or liquefied from heat | - |
| (verb) equip with a fuse; provide with a fuse | - |
| fused | (adjective) joined together into a whole | Synonyms: amalgamate, amalgamated, coalesced, consolidated |
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| fusee | (noun) any igniter that is used to initiate the burning of a propellant | Synonyms: fuse, fuze, fuzee, primer, priming |
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| (noun) a friction match with a large head that will stay alight in the wind | Synonyms: fuzee |
| (noun) a colored flare used as a warning signal by trucks and trains | Synonyms: fuzee |
| (noun) a spirally grooved spindle in a clock that counteracts the diminishing power of the uncoiling mainspring | Synonyms: fusee drive |
| fuselage | (noun) the central body of an airplane that is designed to accommodate the crew and passengers (or cargo) | - |
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| fusible | (adjective) capable of being melted and fused | - |
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| fusiform | (adjective) tapering at each end | Synonyms: cigar-shaped, spindle-shaped |
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| fusil | (noun) a light flintlock musket | - |
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| fusilier | (noun) (formerly) a British infantryman armed with a light flintlock musket | - |
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| fusillade | (noun) rapid simultaneous discharge of firearms | Synonyms: burst, salvo, volley |
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| (verb) attack with fusillade | - |
| fusion | (noun) the act of fusing (or melting) together | - |
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| (noun) correction of an unstable part of the spine by joining two or more vertebrae; usually done surgically but sometimes done by traction or immobilization | Synonyms: spinal fusion |
| (noun) the combining of images from the two eyes to form a single visual percept | Synonyms: optical fusion |
| (noun) an occurrence that involves the production of a union | Synonyms: merger, unification |
| (noun) a nuclear reaction in which nuclei combine to form more massive nuclei with the simultaneous release of energy | Synonyms: nuclear fusion, nuclear fusion reaction |
| (noun) the merging of adjacent sounds or syllables or words | - |
| (noun) the state of being combined into one body | Synonyms: coalition |
| fuss | (noun) a rapid active commotion | Synonyms: ado, bustle, flurry, hustle, stir |
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| (noun) a quarrel about petty points | Synonyms: bicker, bickering, pettifoggery, spat, squabble, tiff |
| (noun) an angry disturbance | Synonyms: bother, hassle, trouble |
| (noun) an excited state of agitation | Synonyms: dither, flap, pother, tizzy |
| (verb) worry unnecessarily or excessively | Synonyms: fret, niggle |
| (verb) care for like a mother | Synonyms: mother, overprotect |
| fussily | (adverb) in a fussy manner | - |
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| fussiness | (noun) unnecessary elaborateness in details | - |
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| (noun) an irritable petulant feeling | Synonyms: choler, crossness, fretfulness, irritability, peevishness, petulance |
| fusspot | (noun) thinks about unfortunate things that might happen | Synonyms: fuss-budget, worrier, worrywart |
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| fussy | (adjective) overcrowded or cluttered with detail | Synonyms: busy |
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| (adjective) annoyed and irritable | Synonyms: bad-tempered, crabbed, crabby, cross, grouchy, grumpy, ill-tempered |
| (adjective) exacting especially about details | Synonyms: finical, finicky, particular, picky |
| fustian | (noun) a strong cotton and linen fabric with a slight nap | - |
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| (noun) pompous or pretentious talk or writing | Synonyms: blah, bombast, claptrap, rant |
| fustigate | (verb) strike with a cudgel | Synonyms: cudgel |
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| fusty | (adjective) old-fashioned and out of date | Synonyms: nonprogressive, standpat, unprogressive |
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| (adjective) stale and unclean smelling | Synonyms: frowsty, musty |