[rey-muh s]
noun, plural ra·mi [rey-mahy] /ˈreɪ maɪ/. Botany, Zoology, Anatomy.
  1. a branch, as of a plant, vein, bone, etc.

Origin of ramus

1795–1805; < Latin rāmus branch, twig, bough; akin to rādīx root1 (see radix)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for rami


  1. the plural of ramus


noun plural -mi (-maɪ)
  1. the barb of a bird's feather
  2. either of the two parts of the lower jaw of a vertebrate
  3. any part or organ that branches from another part

Word Origin for ramus

C19: from Latin: branch
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for rami



"a branch" (anatomical), 1803, from Latin ramus "a branch, bough, twig," related to radix "root;" see radish.

Online Etymology Dictionary, © 2010 Douglas Harper

rami in Medicine


n. pl. ra•mi (-mī′)
  1. Any of the primary divisions of a nerve or blood vessel.
  2. A part of an irregularly shaped bone that is thicker than a process and forms an angle with the main body, especially the ascending part of the lower jaw that makes a joint at the temple.
  3. Any of the primary divisions of a cerebral sulcus.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.