The Collaborative International Dictionary of English v.0.48:

Hamamelis \Ham`a*me"lis\ (h[a^]m`[.a]*m[=e]"l[i^]s), n. [NL.,
   fr. Gr. "amamhli`s a kind of medlar or service tree; "a`ma at
   the same time + mh^lon an apple, any tree fruit.] (Bot.)
   A genus of plants which includes the witch-hazel (Hamamelis
   Virginica), a preparation of which is used medicinally.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Witch-hazel \Witch"-ha`zel\, n. [See Wych-elm, and Hazel.]
   (Bot.)
   The wych-elm.
   (b) An American shrub or small tree (Hamamelis Virginica),
       which blossoms late in autumn.
       [1913 Webster]