
1) Certain quadrilateral 2) Parallelogram 3) Rhomboidal
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https://www.crosswordclues.com/clue/rhomboid

1) Rhomboidal
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https://www.crosswordclues.com/clue/rhomboid

a four-sided figure with opposite sides parallel but with adjacent sides an unequal length (like an oblique rectangle); see also rhombic.
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http://en.wikipedia.org/wiki/Glossary_of_botanical_terms

Traditionally, in two-dimensional geometry, a rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are non-right angled. A parallelogram with sides of equal length (equilateral) is a rhombus but not a rhomboid. A parallelogram with right angled corners is a rectangle but not a rhomboid. The term rhomboid is now mor...
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http://en.wikipedia.org/wiki/Rhomboid

shaped like a parallelogram
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http://phrontistery.info/r.html

• (n.) An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different. • (a.) Same as Rhomboidal.
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http://thinkexist.com/dictionary/meaning/rhomboid/

<geometry> Quadangular, with the lateral angles obtuse. ... (23 Aug 1998) ...
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http://www.encyclo.co.uk/local/20973

(rom´boid) shaped like a rectangle that has been skewed to one side so that the angles are oblique.
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http://www.encyclo.co.uk/local/21001
Rhom'boid (rŏm'boid)
noun [ Greek ......... rhomboidal; ......... rhomb +
e'i^dos shape: confer French
rhomboïde .]
(Geom.) An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.
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http://www.encyclo.co.uk/webster/R/77

Type: Term Pronunciation: rom′boyd, rom-boy′dăl Definitions: 1. Resembling a rhomb (an oblique parallelogram, but having unequal sides); 2. anatomy denoting especially a ligament and two muscles. Synonyms: rhombic1
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http://www.medilexicon.com/medicaldictionary.php?t=78345

A rhomboid is a parallelogram that has only the opposite sides equal, the length and width being different.
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http://www.probertencyclopaedia.com/browse/GR.HTM

[
adj] - shaped like a rhombus or rhomboid 2. [n] - a parallelogram with adjacent sides of unequal lengths 3. [n] - any of several muscles of the upper back that help move the shoulder blade
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http://www.webdictionary.co.uk/definition.php?query=rhomboid

rhomboid 1. A parallelogram with adjacent sides that are not equal. 2. Having a shape similar to a rectangle that has been skewed to one side so that the angles are oblique. 3. Any of several muscles of the upper back that help move the shoulder blade. 4. In anatomy, denoting especially a ligament and two muscles.
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rhombus, four sided figure with equal sides.
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https://aclandanatomy.com/Glossary.aspx
rhomboidal adjective shaped like a rhombus or rhomboid; `rhomboidal shapes`
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https://www.encyclo.co.uk/local/20974

Greek rhombus = a figure with 4 equal sides, not at right angles, and eidos = shape or form, hence, the shape of a rhombus.
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https://www.encyclo.co.uk/local/21450

diamond-shaped an equilateral but not right-angled parallelogram
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https://www.encyclo.co.uk/local/22591
No exact match found.