Source: The Collaborative International Dictionary of English v.0.48
Hyson \Hy"son\, n. [Chin. hi-tshun, lit., first crop, or
blooming spring.]
A fragrant kind of green tea.
[1913 Webster]
Hyson skin, the light and inferior leaves separated from
the hyson by a winnowing machine. --M`Culloch.
[1913 Webster]