adj. A superlative of far.
Most distant in degree, time, or space: That's the furthest thing from my mind. They explored the furthest reaches of space.
adv. A superlative of far.
1. To the greatest extent or degree: went the furthest of all the children in her education.
2. At or to the most distant point in space or time: He swam the furthest.
[Middle English, from further, more distant; see FURTHER.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 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.