Definition of witch hazels:
(n) :
(uncountable) An extract of the bark and/or leaves of this plant, used as an astringent
(n) :
(countable) Any of several small deciduous trees, of the genus Hamamelis, having yellow flowers
(n) :
(US) Hamamelis virginiana (eastern North America)
(n) :
(US) Hamamelis vernalis (Ozarks).
(n) :
(obsolete) A wych-elm, or a certain subspecies of it distinguished from wych-elm.
(n) :
(obsolete, Essex) hornbeam, Carpinus betulus