1. Extending unchecked; unrestrained: a rampant growth of weeds in the neglected yard.
2. Occurring without restraint and frequently, widely, or menacingly; rife: a rampant epidemic; rampant corruption in city government.
a. Rearing on the hind legs.
b. Heraldry Rearing on the left hind leg with the forelegs elevated, the right above the left, and usually with the head in profile.
4. Architecture Springing from a support or an abutment that is higher at one side than at the other: a rampant arch.
In an unrestrained and often menacing manner: vandals running rampant in the city.
[Middle English rampaunt, from Old French rampant, present participle of ramper, to ramp; see RAMP2.]
(click for a larger image)rampant
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.