chesten

† chesteine, chesten Obs.
  Forms: α. 4–5 chastein(e, 5 chasteyn(e, 5–7 chasten, 6 chastayne. β. 4 chesteine, -ene, kesteyn, 4–7 chesten, 5 chestan, 5–6 chesteyn(e, chestayn(e, 5–7 cheston, 6 chestin. See also castane.
  [ME. chasteine (commonly chesteine, etc.), a. OF. chastaigne, -aine (= ONF. castaigne, Pr. castanha, Cat. castanya, Sp. castaña, Pg. castanha, It. castagna):—L. castanea chestnut, a. Gr. καστανέα, synonym of κάστανον, καστάνιον, καστάνειον (in full καστάνειον or κασταναῖον κάρυον, lit. ‘Castanian nut’, referred by some to κασταναία a city of Pontus, by others to Castana in Magnesia (Thessaly). The word was already in OE. in the form cisten-, cyst-béam, corresp. to OHG. ˈchestinna (MHG. ˈkestene, kesten, mod. Upper Ger. keste), pointing to a WGer. *kastinna, *kastinja for *kastanja (prob. by assoc. with Germanic suffix -injô-). It is doubtful whether this OE. form had anything to do with the change of ME. chasteine to chesteine, or whether this was merely due to the obscurity of the first syllable while the stress was still upon -teine. In its latest stage chesten, nut was added: see chestnut n.]
  1. A chestnut-tree.

Oxford English Dictionary