thirst

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thirst sb. OE. þurst = OS thurst (Du. dorst), (O)HG. durst :- WGmc. *þurstu (cf. ON. þorsti, Goth. þaurstei); f. *þurs- :- IE. *tṛs- *tors-, repr. also by L. torrēre dry, parch, Skr. tṛ́ṣyati thirsts, OIr. tart.
So thirst vb. OE. þyrstan (till late ME. also impers.).

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