Definition of "syon"

A Syon̄ or A twige ; Aborigo & proprie est pluralis Numeri, vitulamen, frutex, & cetera ; vbi twigge (A.).

1483, Sidney John Hervon Herrtage, Catholicon Anglicum, page 341

Bot eftir that the thrid syon of treis, / Apon the sandis sittand on my kneis, / I schupe to haue wprevin with mair preise, / Quhidder sall I speik now, or hald my peice ?

1874, Bishop Gawin Douglas and John Small [ed.], The poetical works of Gavin Douglas, bishop of Dunkeld : with memoir, notes, and glossary, page 120 〃, 〃 (W. Paterson)