fuse 2 (fyz)
v. fused, fus·ing, fus·es
a. To join (different pieces or elements) together physically, as by melting or heating: bits of glass fused in a kiln; atomic nuclei that are fused together inside the stars.
b. To blend or combine together: "Edison's invention strategy effectively fused research and development in a seamless process" (Seth Shulman).
2. To liquefy or reduce to a plastic state by heating; melt.
a. To become physically joined together, as by melting.
2. To become liquefied from heat.
A safety device that protects an electric circuit from excessive current, consisting of or containing a metal element that melts when current exceeds a specific amperage, thereby opening the circuit.
[Latin fundere, fūs-, to melt; see gheu- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.