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| Explanation of magnesium (noun) form: no plural alkaline-earth metal with the chemical symbol Mg also needed as a trace element in the body Sample of magnesium Magnesium is needed to help muscles function.
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| Explanation of eyebrow (noun) form plural: eyebrows supercilium Sample of eyebrow The eyebrow helps protect the eye.
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| Explanation of vision problems (noun) form: only plural eyesight difficulties Sample of vision problems They caution, however, against a situation which can occur in the special school when the organisation of the entire curriculum is adapted to the vision problems of the students.
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| Explanation of itchy (adjective) forms: more itchy; itchier; most itchy; itchiest; the most itchy; the itchiest affected with the urge to scratch Sample of itchy Eczema is an itchy skin disease.
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| Explanation of reaction (noun) form plural: reactions a rearrangement in the structures of atoms or molecules to form new products Sample of reaction An example of a chemical reaction is the reduction of iron oxide to iron by carbon monoxide.
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| Explanation of hallucinogen (noun) form plural: hallucinogens drug which affects the central nervous system and cause people to see or experience unusual things outside the range of normal perception Sample of hallucinogen LSD is one of the most popular hallucinogens. Collette Margaret McCarthy, 21, a receptionist, never recovered consciousness and, despite a liver transplant, died on 16 August, 16 days after taking the amphetamine-based hallucinogen, Southwark Coroner's Court in south London was told.
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| Explanation of ritonavir (noun) form: no plural a protease inhibitor applied in treating HIV; trade name: Norvir Sample of ritonavir Ritonavir (trade name Norvir) is one of a class of anti-HIV drugs called protease inhibitors.
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| Explanation of alkali metal (noun) form plural: alkali metals element in the left-hand side of the periodic table Sample of alkali metal Sodium and potassium are alkali metals.
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| Explanation of enthalpy (noun) form plural: enthalpies the total heat content of a system Sample of enthalpy In a chemical reaction the total enthalpy is the amount of energy held in all the bonds of the reactants and products. The change in enthalpy of a process is identical to the heat absorbed or evolved by the system at constant pressure.
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| Explanation of wavelength (noun) form plural: wavelengths the distance between two successive peaks or troughs of a waveform Sample of wavelength The different colors of light are identified by their different wavelengths.
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