from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The thick, solid, transparent outer membrane of a developed mammalian ovum. Also called oolemma.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A glycoprotein membrane surrounding the plasma membrane of an oocyte
from the GNU version of the Collaborative International Dictionary of English
- n. The zona radiata.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. thick membrane around the mammalian ovum; can be penetrated by one sperm in the fertilization process; usually remains around the fertilized egg until it is implanted in the wall of the uterus
New Latin zōna pellūcida : Latin zōna, belt, girdle + Latin pellūcida, feminine of pellūcidus, transparent.(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin zōna ("zone") + pellūcida ("transparent"). (Wiktionary)