noun Anatomy, Zoology.
the filtering and excretory unit of the kidney, consisting of the glomerulus and tubules.

1930–35; < German; alteration of Greek nephrós kidney Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nephron (ˈnɛfrɒn)
any of the minute urine-secreting tubules that form the functional unit of the kidneys

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

nephron neph·ron (něf'rŏn)
The functional unit of the kidney, consisting of the renal corpuscle, the proximal and distal convoluted tubules, and the nephronic loop.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
nephron  [%PREMIUM_LINK%]     (něf'rŏn)  Pronunciation Key 

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The functional unit of the kidney, in which waste products are filtered from the blood and urine is produced. The nephron consists of a system of tubules in close association with a network of blood vessels. As fluid that is filtered through the glomerulus of the nephron enters the tubules, its composition is gradually changed by the absorption and secretion of solutes, and it eventually leaves the nephron as urine. See more at Bowman's capsule, glomerulus, loop of Henle.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
At the beginning of each nephron, a web of capillaries releases much water and other molecules into the nephron.
The crucial structure of the kidneys is the nephron, a microscopic tangle of capillaries and membranes.
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