The Collaborative International Dictionary of English v.0.48:

Ginkgo \Gink"go\, n.; pl. Ginkgoes. [Chin., silver fruit.]
   (Bot.)
   A large ornamental tree (Ginkgo biloba) from China and
   Japan, belonging to the Yew suborder of Conifer[ae]. Its
   leaves are so like those of some maidenhair ferns, that it is
   also called the maidenhair tree.
   [1913 Webster] Ginkgophytina
   Ginkgophyta

The Collaborative International Dictionary of English v.0.48:

maidenhair tree \maidenhair tree\ n.
   A deciduous dioecious gymnospermous Chinese tree (Ginkgo
   biloba) having fan-shaped leaves and fleshy yellow seeds,
   also called the ginkgo; it exists almost exclusively in
   cultivation esp. as an ornamental street tree.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

ginkgo
    n 1: deciduous dioecious Chinese tree having fan-shaped leaves
         and fleshy yellow seeds; exists almost exclusively in
         cultivation especially as an ornamental street tree [syn:
         ginkgo, gingko, maidenhair tree, Ginkgo biloba]