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Arrhenius equation
arrhythmia
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arrière-pensée
arris
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arrector pili

arrector pili [ a rék tawr pli ]


noun 
Definition:
 
muscle making hair stand up: a small muscle connecting a hair follicle to the dermis that contracts to make the hair stand erect in response to cold or fear

[< modern Latin, 'raiser of hair']
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