Definition of macrochromosome in 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/