meroblastic cleavage

https://doi.org/10.1351/goldbook.10529

Partial cleavage of the egg, occurring in some animals, such as reptiles and birds, whose eggs have a large amount of yolk, resulting in unequal blastomeres and only part of the egg progressing to further cell division; the yolk mass remains and has nutritive value.

Source:
PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 736 (https://doi.org/10.1515/pac-2015-1202)