Etymology
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pureblood (adj.)

also pure-blood, "of unmixed inheritance or ancestry," 1851, from pure blood (n.), attested from 1751 in reference to breeding, from pure (adj.), which is attested from late 15c. in reference to unmixed descent or lineage, + blood (n.). As a noun meaning "a pure-blood animal" from 1882.

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Definitions of pureblood
1
pureblood (n.)
a pedigreed animal of unmixed lineage; used especially of horses;
Synonyms: thoroughbred / purebred
2
pureblood (adj.)
having a list of ancestors as proof of being a purebred animal;
Synonyms: pedigree / pedigreed / pureblooded / thoroughbred
From wordnet.princeton.edu