[ 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.

Origin of rhomboid

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

Related forms

rhom·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

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 (1 of 2)


[ rŏmboid′ ]

A parallelogram with unequal adjacent sides.

Related forms

rhomboid, rhomboidal adjective

Science definitions for rhomboid (2 of 2)


[ rŏmbəs ]

Plural rhombuses rhombi (rŏm)

A parallelogram with four equal sides; an equilateral parallelogram.

Related forms

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