(usually of animals) the line of descent; pedigree; strain.

1905–10; blood + line1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bloodline (ˈblʌdˌlaɪn)
all the members of a family group over generations, esp regarding characteristics common to that group; pedigree

Collins English Dictionary - Complete & Unabridged 10th Edition
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

bloodline blood·line (blŭd'līn')
The direct line of descent; a pedigree.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Why take a full bloodline horse, when you can get a horse that is versatile.
Moreover, as families mingle and fracture over generations, ownership becomes
  diluted along with the bloodline.
The consequence of being in thrall to a bloodline is a weak party that lacks
  shared policies or common values.
She has been married-off,settled, has had a couple of babies and the bloodline
  is well established.
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