rhom·​boid | \ ˈräm-ˌbȯid How to pronounce rhomboid (audio) \

Definition of rhomboid

 (Entry 1 of 2)

: a parallelogram with no right angles and with adjacent sides of unequal length


rhom·​boid | \ ˈräm-ˌbȯid How to pronounce rhomboid (audio) \
variants: or rhomboidal \ räm-​ˈbȯi-​dᵊl How to pronounce rhomboid (audio) \

Definition of rhomboid (Entry 2 of 2)

: shaped somewhat like a rhombus or rhomboid

Illustration of rhomboid

Illustration of rhomboid


In the meaning defined above

Did you know?

Rhomboids, like triangles, may take various different shapes, but they always look like a lopsided diamond or rectangle. As both a noun and an adjective, rhomboid can be applied to anything with those shapes, such as certain muscles of the upper back when viewed from behind. Whenever you hear about rhomboid exercises, rhomboid strain, or rhomboid pain, it involves those muscles, which attach your shoulder blades to your spine and can be strained by carrying a heavy backpack, serving a tennis ball, or just slumping in your chair in front of a computer all day.

Examples of rhomboid in a Sentence

Recent Examples on the Web: Noun To strengthen the rotator cuff, middle trapezius and rhomboid muscles HOW: Hold an exercise band with an underhand grip with your elbows bent to 90-degrees. Jon-erik Kawamoto, Outside Online, 6 Nov. 2019 Even their origin story has seemed uncertain since the 1997 discovery of a prehistoric Indonesian cave painting of what appears to be a floating rhomboid. New York Times, 29 Sep. 2021 The iconic John Hancock Tower, a 62-story rhomboid sheathed in mirrored glass that reflects the sky and the buildings around it, was once deemed to be at risk of literally falling down. BostonGlobe.com, 25 June 2021 His 237,000-square-foot translucent glass construction features terrazzo details and a curve used by Mies in the original building, while its striking rhomboid shape corresponds to the street edges. Leena Kim, Town & Country, 23 Oct. 2020 That's because strengthening your back muscles—think your lats, rhomboids, and traps—help improve muscle imbalances and posture. Christa Sgobba, SELF, 3 Apr. 2020 Kids can build an infinite number of designs using just five triangles, one square and one rhomboid. cleveland, 16 Mar. 2020 Most of the muscles that people really need to strength-train — hamstrings, glutes, lower back, rhomboids, triceps — are not really worked during rock climbing. Kate Dwyer, New York Times, 14 Nov. 2019 Lat Pull with Arm Rotation Lat pulls work your lats, mid traps, and rhomboids, says Braithwaite. Leah Prinzivalli, SELF, 5 Oct. 2018 Recent Examples on the Web: Adjective Rest is the initial plan for outfielder Max Kepler, who missed much of September because of a rhomboid strain — although Falvey said that Kepler will see a specialist. Betsy Helfand, Twin Cities, 9 Oct. 2019 McIlroy said the injury is to a rhomboid muscle on the left side of his body. Rick Bonnell, charlotteobserver, 13 Aug. 2017 McIlroy, 28, punctuated a quiet week with a 68, his first sub-70 round of the tournament, and then said a lingering rib injury — a spasming left rhomboid muscle, to be precise — could sideline him indefinitely. Karen Crouse, New York Times, 13 Aug. 2017 See More

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'rhomboid.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

First Known Use of rhomboid


1570, in the meaning defined above


1681, in the meaning defined above

History and Etymology for rhomboid


Middle French rhomboïde, from Latin rhomboides, from Greek rhomboeidēs resembling a rhombus, from rhombos

Learn More About rhomboid

Time Traveler for rhomboid

Time Traveler

The first known use of rhomboid was in 1570

See more words from the same year

Dictionary Entries Near rhomboid




See More Nearby Entries 

Statistics for rhomboid

Cite this Entry

“Rhomboid.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/rhomboid. Accessed 4 Jul. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon


Test Your Vocabulary

Odd Habits and Quirks

  • image1926873504
  • Which of the following best describes an easily irritated person?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

Universal Daily Crossword

A daily challenge for crossword fanatics.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!