The Collaborative International Dictionary of English v.0.48:

Corylaceae \Corylaceae\ prop. n.
   A natural family of shrubs or small trees, used in some
   classification systems for the genus Corylus.

   Syn: subfamily Corylaceae, family Corylaceae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Corylaceae
    n 1: used in some classification systems for the genus Corylus
         [syn: Corylaceae, subfamily Corylaceae, family
         Corylaceae]