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Definition of Ad-

Ad-: Prefix indicating toward or in the direction of. For example, adduction is the movement of a limb toward the midline of the body, and adrenal literally means 'toward the kidney.'

Source: MedTerms™ Medical Dictionary
http://www.medicinenet.com/script/main/art.asp?articlekey=6579
Last Editorial Review: 3/19/2012

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