Definition of macrosomite in US English:

macrosomite

noun

Entomology
  • Any of several anatomical regions formed prior to the formation of true metameres during segmentation of the embryo of certain insects.

Origin

Late 19th century; earliest use found in American Naturalist. From macro- + somite, after German Makrosomit.

Pronunciation

macrosomite

/ˌmakrəʊˈsəʊmʌɪt/