Definition of macrochromosome in US English:

macrochromosome

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).

Pronunciation

macrochromosome

/ˌmakrə(ʊ)ˈkrəʊməsəʊm/