[ rey-muh s ]
/ ˈreɪ məs /

noun, plural ra·mi [rey-mahy] /ˈreɪ maɪ/. Botany, Zoology, Anatomy.

a branch, as of a plant, vein, bone, etc.

Nearby words

  1. ramstedt operation,
  2. ramtil,
  3. ramulose,
  4. ramulous,
  5. ramulus,
  6. ramée,
  7. ramòn y cajal,
  8. ramón,
  9. ramón y cajal,
  10. ramón y cajal, santiago

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. 2019

Examples from the Web for ramus

British Dictionary definitions for ramus


/ (ˈreɪməs) /

noun plural -mi (-maɪ)

the barb of a bird's feather
either of the two parts of the lower jaw of a vertebrate
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 ramus



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

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for ramus


[ rāməs ]

n. pl. ra•mi (-mī′)

Any of the primary divisions of a nerve or blood vessel.
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.
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.