| ferret | (noun) domesticated albino variety of the European polecat bred for hunting rats and rabbits | - |
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| (noun) musteline mammal of prairie regions of United States; nearly extinct | Synonyms: black-footed ferret, Mustela nigripes |
| (verb) search and discover through persistent investigation | Synonyms: ferret out |
| (verb) hunt with ferrets | - |
| (verb) hound or harry relentlessly | - |
| ferric | (adjective) of or relating to or containing iron | Synonyms: ferrous |
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| ferricyanide | (noun) salt of ferricyanic acid obtained by oxidation of a ferrocyanide | - |
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| ferrimagnetism | (noun) a phenomenon in ferrites where there can be incomplete cancellation of antiferromagnetic arranged spins giving a net magnetic moment | - |
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| ferrite | (noun) a solid solution in which alpha iron is the solvent | - |
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| (noun) a magnetic allotrope of iron; stable below 906 degrees centigrade | Synonyms: alpha-Fe, alpha-ferrite |
| ferritin | (noun) a protein containing 20% iron that is found in the intestines and liver and spleen; it is one of the chief forms in which iron is stored in the body | - |
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| ferrocerium | (noun) a pyrophoric alloy of iron with cerium; used for lighter flints | - |
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| ferroconcrete | (noun) concrete with metal and/or mesh added to provide extra support against stresses | Synonyms: reinforced concrete |
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| ferrocyanide | (noun) salt of ferrocyanic acid usually obtained by a reaction of a cyanide with iron sulphate | - |
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| ferromagnet | (noun) any material that has ferromagnetic properties. | - |
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| ferromagnetic | (adjective) relating to or demonstrating ferromagnetism | - |
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| ferromagnetism | (noun) phenomenon exhibited by materials like iron (nickel or cobalt) that become magnetized in a magnetic field and retain their magnetism when the field is removed | - |
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| ferrous | (adjective) of or relating to or containing iron | Synonyms: ferric |
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| ferrule | (noun) a metal cap or band placed on a wooden pole to prevent splitting | Synonyms: collet |
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| ferry | (noun) transport by boat or aircraft | Synonyms: ferrying |
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| (noun) a boat that transports people or vehicles across a body of water and operates on a regular schedule | Synonyms: ferryboat |
| (verb) travel by ferry | - |
| (verb) transport by ferry | - |
| (verb) transport from one place to another | - |
| ferryboat | (noun) a boat that transports people or vehicles across a body of water and operates on a regular schedule | Synonyms: ferry |
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| ferrying | (noun) transport by boat or aircraft | Synonyms: ferry |
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| ferryman | (noun) a man who operates a ferry | - |
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