a learned borrowing from Greek meaning “vessel,” “container,” used in the formation of compound words: angiosperm.
Also, especially before a vowel, angi-.

< Greek, combining form representing angeîon, equivalent to áng(os) vessel, vat, shell + -eion diminutive suffix Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
angio- or (before a vowel) angi-
combining form
indicating a blood or lymph vessel; seed vessel: angiology; angiosperm; angioma
[from Greek angeion vessel]
angi- or (before a vowel) angi-
combining form
[from Greek angeion vessel]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

prefix, now usually meaning "covered by a seed or blood vessel," from Gk. angeion "a vessel," dim. of angos "chest, box," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

angio- or angi-
Blood and lymph vessel: angiography.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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