SUBZONAL

Etymology

Adjective

subzonal (not comparable)

Relating to a subzone.

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

Source: Wiktionary

Sub*zon"al, a. (Anat.)

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

Source: Webster’s Unabridged Dictionary 1913 Edition