Biology. the formation and development of blood vessels.

angio- + -genesis

angiogenic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
angiogenesis (ˌændʒɪəˈɡɛnɪsɪs)
the induction of blood-vessel growth, often in association with a particular organ or tissue, or with a tumour

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1899, from angio- + genesis.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

angiogenesis an·gi·o·gen·e·sis (ān'jē-ō-jěn'ĭ-sĭs)
The development of the blood vessels.

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
angiogenesis   (ān'jē-ō-jěn'ĭ-sĭs)  Pronunciation Key 
The formation of new blood vessels, especially blood vessels that supply oxygen and nutrients to cancerous tissues.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
One highly regarded treatment under study involves drugs known as anti-angiogenesis factors.
If angiogenesis can be stopped, then a patient's cancer won't be able to spread.
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