- The nutritive yolk of a meroblastic egg.
- some regarding the mesoblast (of peripheral origin) for the developing embryo, whoever cells take part in the forming of the first bloodstream and blood vessels.
- a percentage of this mesoblast (of peripheral source) regarding the developing embryo, the cells that are especially worried in developing the initial bloodstream and arteries.
- The supplementary or nutritive yolk of a meroblastic egg or metovum, as distinguished from the archiblast,or formative yolk.
- identical to mesoblast.