the transparent, noncellular layer surrounding the ovum of mammals, often having radial striations.
Foulis regards the zona pellucida as a product of the ovum and not of the follicle.
The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour
zona pellucida zona pel·lu·ci·da (pə-lōō’sĭ-də, pěl-yōō’-)
The thick solid transparent outer membrane of a developed mammalian ovum. Also called oolemma.
- Zona reticularis
zona reticularis zona reticularis zona re·tic·u·lar·is (rĭ-tĭk’yə-lâr’ĭs) n. The inner layer of the cortex of the adrenal gland in which cell cords form a network. Historical Examples Most superficially is the zona glomerulosa, then the zona fascicularis, and most deeply the zona reticularis. Encyclopaedia Britannica, 11th Edition, Volume 8, Slice 8 Various
- Zona tecta
zona tecta zona tecta zona tec·ta (těk’tə) n. See arcuate zone.
of or relating to a or . of the nature of a . Historical Examples It underlies the whole significance of zonal location, continental and insular. Influences of Geographic Environment Ellen Churchill Semple zonal range: Upper Sonoran areas that are moist yet safe from continuous inundation. North American Jumping Mice (Genus Zapus) Philip H. Krutzsch […]
- Zonal geranium
a widely cultivated plant, Pelargonium hortorum, having white, pink, or red flowers and rounded leaves that are sometimes banded or blotched with contrasting colors.