[ih-rith-roh-poi-i-tn, -poi-eet-n]
noun Biochemistry.
a hormone that stimulates production of red blood cells and hemoglobin in the bone marrow, synthesized in response to low levels of oxygen in the tissues.

1945–50; erythropoiet(ic) + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
erythropoietin (ɪˌrɪθrəʊpɔɪˈiːtɪn)
EPO a hormone, secreted by the kidney in response to low levels of oxygen in the tissues, that increases the rate of erythropoiesis. It has been used as a performance-enhancing drug for athletes and racehorses

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

erythropoietin e·ryth·ro·poi·e·tin (ĭ-rĭth'rō-poi-ē'tĭn)
A glycoprotein hormone that stimulates the production of red blood cells by bone marrow.

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
erythropoietin   (ĭ-rĭth'rō-poi-ē'tĭn)  Pronunciation Key 
A glycoprotein hormone, secreted mostly by the kidneys in adults and the liver in children, that stimulates stem cells in the bone marrow to produce red blood cells.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Some then turned to erythropoietin, a blood-enhancing drug.
His level of erythropoietin, the kidney's bone-marrow stimulator, must have
  been low for months.
Without erythropoietin, patients may become anemic, making them feel weak and
Erythropoietin is the hormone that acts in the bone marrow to increase the
  production of red blood cells.
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