[ rom-boid ]
/ ˈrɒm bɔɪd /


an oblique-angled parallelogram with only the opposite sides equal.
Anatomy. rhomboideus.


Also rhom·boi·dal. having a form like or similar to that of a rhombus; shaped like a rhomboid.

Nearby words

  1. rhombic aerial,
  2. rhombo-,
  3. rhombocele,
  4. rhombohedral,
  5. rhombohedron,
  6. rhomboid fossa,
  7. rhomboid ligament,
  8. rhomboidal sinus,
  9. rhomboideus,
  10. rhombus

Origin of rhomboid

1560–70; < Late Latin rhomboīdes < Greek rhomboeidḕs (schêma) rhomboid (form, shape). See rhombus, -oid

Related formsrhom·boi·dal·ly, adverbsub·rhom·boid, adjectivesub·rhom·boi·dal, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for rhomboid

British Dictionary definitions for rhomboid


/ (ˈrɒmbɔɪd) /


a parallelogram having adjacent sides of unequal length

adjective Also: rhom'boidal

having such a shape

Word Origin for rhomboid

C16: from Late Latin rhomboides, from Greek rhomboeidēs shaped like a rhombus

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 rhomboid



1560s, from Middle French rhomboide or directly from Late Latin rhomboides, from Greek rhomboeides "rhomboidal; a rhomboid;" see rhombus + -oid. Related: Rhomboidal. As an adjective from 1690s.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for rhomboid


[ rŏmboid′ ]


Resembling a parallelogram having unequal adjacent sides.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for rhomboid


[ rŏmboid′ ]

A parallelogram with unequal adjacent sides.
Related formsrhomboid, rhomboidal adjective


[ rŏmbəs ]

Plural rhombuses rhombi (rŏm)

A parallelogram with four equal sides; an equilateral parallelogram.
Related formsrhomboid, rhomboidal adjective

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.