gemmule
In biology, a gemmule is a resistant asexual reproductive structure produced by sponges. This term is domain-specific.
Sponges sometimes form gemmules to reproduce asexually.
blast cell; blast
In cell biology, a blast is an immature precursor cell. This term is domain-specific.
In bone marrow, abnormal proliferation of blast cells can cause leukemia.
megaloblast
myeloblast
lymphoblast
Compound of 芽 (ga, 'bud, sprout') and 球 (kyū, 'sphere, ball'), referring to a bud-like spherical structure. The exact historical derivation is uncertain; the spelling is conventionally associated with the biological meanings.