Taber’s Cyclopedic Medical Dictionary Online + App from F.A. Davis and Unbound Medicine. Find 65,000 medical and nursing definitions. Download to iPhone, iPad, and Android. Explore these free sample topics:
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[Gr. phasis, an appearance]
1. A stage of development.
2. A transitory appearance.
3. In chemistry, a distinct component of a larger, heterogeneous system, as oil or water when the two are mixed.