an oblique-angled parallelogram with only the opposite sides equal.
Anatomy, rhomboideus.
Also, rhomboidal. having a form like or similar to that of a rhombus; shaped like a rhomboid.

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

rhomboidally, adverb
subrhomboid, adjective
subrhomboidal, adjective
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World English Dictionary
rhomboid (ˈrɒmbɔɪd)
1.  a parallelogram having adjacent sides of unequal length
2.  having such a shape
[C16: from Late Latin rhomboides, from Greek rhomboeidēs shaped like a rhombus]

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American Heritage
Medical Dictionary

rhomboid rhom·boid (rŏm'boid') or rhom·boi·dal (rŏm-boid'l)
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.
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American Heritage
Science Dictionary
rhomboid   (rŏm'boid')  Pronunciation Key 
A parallelogram with unequal adjacent sides.

rhomboid, rhomboidal adjective
rhombus   (rŏm'bəs)  Pronunciation Key 
Plural rhombuses or rhombi (rŏm'bī)
A parallelogram with four equal sides; an equilateral parallelogram.

rhomboid, rhomboidal adjective
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Here, the diffuse area is resolved into a rhomboid-shaped group of clearly defined sources.
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