(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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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 for Bloodlines
Some bloodlines of humans are known for having unusual physical traits.
Bloodlines are often considered, as some bloodlines are known to cross well with others.
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