#acrocyst
- Acrocyst — A temporary spherical anatomical structure or protective vesicular sac formed during the reproduction of certain colonial hydrozoans, protecting eggs or planulae.
- Acrocyst — An anatomical, external, and temporary vesicular formation observed in the development cycle of certain marine hydroid organisms (polyps, hydrozoans), serving as a protective chamber or external structural sac inside which the sexual cells (eggs) are retained and protected during the initial stages of embryonic development before their release as planula.