Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Situated under a zone, or zona; applied to a membrane between the zona radiata and the umbilical vesicle in the mammal embryo.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Situated under a zone, or zona; -- applied to a membrane between the zona radiata and the umbilical vesicle in the mammal embryo.

from The Century Dictionary and Cyclopedia

  • Somewhat zonal or zonary, as the placenta of some mammals.
  • Lying below a zone, belt, or girdle: noting a membrane between the zona radiata and the umbilical vesicle of a mammalian embryo.

Etymologies

sub +‎ -zonal (Wiktionary)

Examples

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