[Latin fūrunculus, knob on a vine that "steals" the sap, diminutive of fūr, thief (modeled on latrunculus, robber, diminutive of latrō, latrōn-, bandit); see bher-1 in the Appendix of Indo-European roots.]
fu·runcu·lar (fy-rŭngkyə-lər), fu·runcu·lous (-ləs) adj.
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.