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.

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

Contemporary Examples of rhomboid

Historical Examples of rhomboid

  • He named it rhomboides, meaning "rhomboid," from the shape of its body.

    Bass, Pike, Perch, and Others

    James Alexander Henshall

  • I am simply telling you what Dr. Rhomboid told me last night.

    The Passion for Life

    Joseph Hocking

  • Then came Dr. Rhomboid's verdict, followed by my visit to Cornwall.

    The Passion for Life

    Joseph Hocking

  • It is nearly a year since I came here, and a year was all Dr. Rhomboid gave me to live.

    The Passion for Life

    Joseph Hocking

  • Occasionally they are elongated and flattened; they then assume the form of a rhomboid.

British Dictionary definitions for rhomboid



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

rhomboid in Medicine




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.

rhomboid in Science



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



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.