rd- The American Heritage® Dictionary of the English Language: Fourth Edition. 2000.

The American Heritage^® Dictionary of the English Language: Fourth Edition. 2000.

Appendix I

Indo-European Roots

ENTRY:	rd-
DEFINITION:	To scrape, scratch, gnaw. Oldest form re₁d-,* contracted to rd-. 1. O-grade form rd-. a. rodent; corrode, erode, from Latin rdere, to gnaw; b. suffixed (instrumental) form rd-tro-. rostrum, from Latin rstrum,* beak, ship's bow. 2. Possibly extended zero-grade form rd-d-, becoming razd-, whence rd- in Latin. a. radula, rape³, rappee, rascal, rash², rasorial, ratiné, ratteen, raze, razor; abrade, corrade, erase, from Latin rdere,* to scrape; b. suffixed (instrumental) form rd-tro-. raclette, raster, from Latin rstrum,* rake. 3. Zero-grade form rd-. rat, from Old English ræt,* rat, from Germanic rattn-. (Pokorny 2. rd-* 854.)


The American Heritage^® Dictionary of the English Language, Fourth Edition. Copyright © 2000 by Houghton Mifflin Company. Published by the Houghton Mifflin Company. All rights reserved.