Obs. [perh. of Scand. origin (cf. Sw. (h)jolster, (h)jelster, (h)ilster, Norw. ister, ON. *jǫlstr, ilstri, pointing to orig. *elustr- and *elustrj-); but possibly from an unrecorded OE. *eolstr.] Some kind of willow or osier.
1387. Demise of site in Scagglethorpe, Yorks. (MS.). Omnes yolstres crescen[tes] super ripam de Ouse infra dominium de Scahylthorp. Ibid. (1395), Yholsters. [See Yorks. Deeds (Yorks. Archæol. Soc.) II. 161.]
