1. A natural hot spring that intermittently ejects a column of water and steam into the air.
2. (gēzər) Chiefly British A gas-operated hot-water heater.
[After Icelandic Geysir, name of a hot spring of southwest Iceland, from geysa, to gush, from Old Norse; see gheu- in the Appendix of Indo-European roots.]
(click for a larger image)geyser
Water contained in porous rock seeps into an opening. Heated by magma below, it escapes under pressure to the earth's surface.
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.