liq·ue·fy also liq·ui·fy (lĭkwə-fī′)
v. liq·ue·fied, liq·ue·fy·ing, liq·ue·fies also liq·ui·fied or liq·ui·fy·ing or liq·ui·fies
To cause to become liquid, especially:
a. To melt (a solid) by heating.
b. To condense (a gas) by cooling.
To become liquid.
[Middle English liquefien, from Old French liquefier, from Latin liquefacere : liquēre, to be liquid + facere, to make; see FACT.]
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.