cul-de-sac (kŭldĭ-săk, kl′-)
n. pl. cul-de-sacs or culs-de-sac (kŭlz-, klz′-)
a. A dead-end street, especially one ending in a circular turnaround.
b. A circular turnaround at the end of a dead-end street.
c. An impasse: "This was the cul-de-sac the year kept driving me toward: men and women would always be at odds" (Philip Weiss).
2. Anatomy A saclike cavity or tube open only at one end.
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.