ZO´NA PELLU´CIDA, _n._ Consolidated membranous envelope of the primitive
ovum.
ZOÖLOGY, _n._ Natural history of animals, of which ornithology is one
department.
ZYGAPOPH´YSIS, _a._ Articular process of a vertebra.
ZYGODAC´TYLE, _a._ Yoke-toed; having the toes in pairs, two before and
two behind.
ZYGO´MA, _n._ Malar bone and its connections.
ZYGOMAT´IC, _a._ Pertaining to the malar bone.