Artificial intelligent assistant

thestri

thestri, a. Obs.
  Forms: 1 ðiostriᵹ, þystriᵹ, 3 þeostri, 4 thestri.
  [OE. þ{iacu}ostriᵹ, f. þ{iacu}ostre, þéostre, thester a. + -iᵹ: see -y.]
  Dark (lit. and fig.); = thester a.

a 900 Wærferth Gregory's Dial. (1900) 76 Þonne bið þin lichama eall þystriᵹ. c 950 Lindisf. Gosp. Mark viii. 17 Ðiostriᵹ..ᵹie habbað hearta iuer. a 1240 Ureisun in Cott. Hom. 200 Aliht mine þeostri heorte. c 1325 Body & Soul in Map's Poems (Camden) 346 In a thestri stude y stod.

Oxford English Dictionary

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