Webster’s Revised Unabridged Dictionary · 1913 Quadroon Quad·roon′ (kwŏd·ro͞on′), n. [F. quarteron, or Sp. cuarteron. See Quarter a fourth part, and cf. Quarteron.] The offspring of a mulatto and a white person; a person quarter-blooded. [Written also quarteron, quarteroon, and quateron.] ‹ Quadrivium Quadroxide ›