"person of mixed race," 1826; see half + blood (n.). As an adjective, "born of one parent the same and one different," from 1550s. Half-blooded as an adjective in this sense is from c. 1600.
half
half seas over
half-and-half
half-assed
half-baked
half-blood
half-breed
half-brother
half-caste
half-cent
half-dime