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Meaning of activation energy, wavelength, diffusion, theory, teratogen, diglyceride, venepuncture, ophthalmology, myopia, formation

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Meaning of activation energy (noun)
form plural: activation energies

the energy needed to start a chemical reaction

Example
Activation energies explain why reaction rates vary with different temperatures.

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Meaning of wavelength (noun)
form plural: wavelengths

the distance between two successive peaks or troughs of a waveform

Example
The different colors of light are identified by their different wavelengths.

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Meaning of diffusion (noun)
form: no plural

transmission of light through a surface

Example
Diffusion accounts for the fact that an open bottle of perfume can quickly be smelled across the room.

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Meaning of theory (noun)
form plural: theories

a general principle which helps to explain the world around us and relates facts to each other

Example
Theories develop from hypotheses which are proven to be true from experiments.

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Meaning of teratogen (noun)
form plural: teratogens

any substance, chemical or otherwise, which causes abnormalities in the developing fetus

Example
Thalidomide is a teratogen as it affects limb development.

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Meaning of diglyceride (noun)
form plural: diglycerides

contains two fatty acids joined to a glycerol molecule

Example
A diglyceride can also be called a diacylglycerol.

What does diglyceride mean?
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Meaning of venepuncture (noun)
form plural: venepunctures

the puncture of a vein in order to take blood

Example
Blood is taken for testing by venipuncture.

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Meaning of ophthalmology (noun)
form: no plural

branch of medicine that deals with the eye and its diseases

Example
Ophthalmology is a medical specialty.

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Meaning of myopia (noun)
form: no plural

shortsightedness

Example
Someone who has myopia can clearly see close objects but not distant objects.

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Meaning of formation (noun)
form plural: formations

spatial shape or position; the process of making something

Example
An alpha helix structure involves the formation of spiral coils of the polypeptide chains.

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