Defn: See Zumbooruk.
ZONA
Zo"na, n.; pl. Zonæ. Etym: [L., a girdle. See Zone.]
Defn: A zone or band; a layer. Zona pellucida. Etym: [NL.] (Biol.) (a) The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating striæ, and corresponds to the cell wall of an ordinary cell. See Ovum, and Illust. of Microscope. (b) The zona radiata. — Zona radiata Etym: [NL.] (Biol.), a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.
ZONAL
Zon"al, a. Etym: [L. zonalis.]
Defn: Of or pertaining to a zone; having the form of a zone or zones. Zonal equation (Crystallog.), the mathematical relation which belongs to all the planes of a zone, and expresses their common position with reference to the axes. — Zonal structure (Crystallog.), a structure characterized by the arrangements of color, inclusions, etc., of a crystal in parallel or concentric layers, which usually follow the outline of the crystal, and mark the changes that have taken place during its growth. — Zonal symmetry. (Biol.) See the Note under Symmetry.
ZONAR
Zo"nar, n. Etym: [Mod. Gr. Zone.]
Defn: A belt or girdle which the Christians and Jews of the Levant were obliged to wear to distinguish them from Mohammedans. [Written also zonnar.]
ZONARIA
Zo*na"ri*a, n. pl. Etym: [NL.] (Zoöl.)
Defn: A division of Mammalia in which the placenta is zonelike.
ZONATE
Zon"ate, a. (Bot.)