pure-bred

Concise Oxford English Dictionary © 2008 Oxford University Press:
pure/pjʊə(r)/

▶adjective

• 1 not mixed or adulterated with any other substance or material.

  ■ (also pure-bred) (of an animal or plant) of unmixed origin or descent.

• 2 innocent or morally good.

• 3 (of a sound) perfectly in tune and with a clear tone.

• 4 (of a subject) theoretical rather than practical. Compare with applied.

• 5 complete; nothing but.

• 6 Phonetics (of a vowel) not joined with another to form a diphthong.

– derivatives
purely adverb,
pureness noun.

– origin ME: from OFr. pur ‘pure’, from L. purus.