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The Collaborative International Dictionary
Thilk

Thilk \Thilk\, pron. [Cf. Ilk same.] That same; this; that. [Obs.] ``I love thilk lass.''
--Spenser.

Thou spake right now of thilke traitor death.
--Chaucer.

Douglas Harper's Etymology Dictionary
thilk

"that same, the very thing," early 13c., contraction from þe "the" (see the) + ilce "same" (see ilk).

Wiktionary
thilk

det. (context now archaic regional English) That same; this; that. (from 13th c.)