a. A sensation of dryness in the mouth and throat related to a need or desire to drink.
b. The desire to drink.
2. An insistent desire; a craving: a thirst for knowledge.
intr.v. thirst·ed, thirst·ing, thirsts
1. To feel a need to drink.
2. To have a strong craving; yearn.
[Middle English, from Old English thurst; see ters- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.