thoroughbred

From thorough +‎ bred.

thoroughbred (comparative more thoroughbred, superlative most thoroughbred)

1. Bred from pure stock.
2. Well-bred and properly educated.

• thoroughbreed

thoroughbred (plural thoroughbreds)

1. Alternative letter-case form of Thoroughbred (“horse bred for racing”)
2. (loosely) Any purebred horse.
3. A person of uncommon strength or endurance (like that of a thoroughbred horse).

   That athlete is a real thoroughbred.

4. A well-bred person.

•   thoroughbred on Wikipedia.Wikipedia
• “thoroughbred”, in OneLook Dictionary Search.
• “thoroughbred”, in The Century Dictionary […], New York, N.Y.: The Century Co., 1911, →OCLC.