[Betula + -aceae]
A family of flowering, nut-bearing trees, the birch family, that also includes alders, hazels, and hornbeams. Pollen from members of this family produces allergic reactions in many people in the early spring.
Taber’s Cyclopedic Medical Dictionary 24th Edition Online + App from F.A. Davis and Unbound Medicine. Find 75,000 medical and nursing definitions. Download to iPhone, iPad, and Android. Complete Product Information.