adj. thread·i·er, thread·i·est
1. Consisting of or resembling thread; filamentous.
2. Capable of forming or tending to form threads; viscid.
3. Medicine Weak and shallow. Used of a pulse.
4. Lacking fullness of tone; thin: a thready voice.
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.