caulk also calk (kôk)
v. caulked, caulk·ing, caulks also calked or calk·ing or calks
1. To make watertight or airtight by filling or sealing: caulk a pipe joint; caulked the cracks between the boards with mud.
2. Nautical To make (a boat) watertight by packing seams with a waterproof material, such as oakum or pitch.
To apply caulking: caulked all around the window frame.
[Middle English cauken, to press, from Old North French cauquer, from Latin calcāre, to tread, from calx, heel.]
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.