Definition of macrochromosome in English:

macrochromosome

Pronunciation /ˌmakrə(ʊ)ˈkrəʊməsəʊm/

noun

Biology
  • A large chromosome, especially in the karyotype of a bird or reptile.

Origin

Early 20th century; earliest use found in Edmund Beecher Wilson (1856–1939).