from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Material derived from the Golgi apparatus from which the acrosome develops during spermatogenesis.
- n. (archaic) A type of embryonic cell forming a layer external to the mesoblast.
from The Century Dictionary and Cyclopedia
- n. In embryology, that portion of the embryonic germ-layers in vertebrates which gives rise to the blood and connective tissue; the mesenchyme.
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