tis·sue (tĭsh, -y)
1. A fine, very thin fabric, such as gauze.
2. Tissue paper.
3. A soft, absorbent piece of paper used as toilet paper, a handkerchief, or a towel.
4. An interwoven or interrelated number of things; a web; a network: "The text is a tissue of mocking echoes" (Richard M. Kain).
5. Biology An aggregation of morphologically similar cells and associated intercellular matter acting together to perform one or more specific functions in an organism. There are four basic types of tissue in many animals: muscle, nerve, epidermal, and connective.
[Middle English tissu, a rich kind of cloth, from Old French, from past participle of tistre, to weave, from Latin texere; see teks- 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.