Main Difference
The main difference between Rhomboid and Rhombus is that the Rhomboid is a parallelogram in which adjacent sides are of unequal lengths and angles are oblique and Rhombus is a quadrilateral in which all sides have the same length
Rhomboid vs. Rhombus
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Rhomboid
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 more often used for a rhombohedron or a more general parallelepiped, a solid figure with six faces in which each face is a parallelogram and pairs of opposite faces lie in parallel planes. Some crystals are formed in three-dimensional rhomboids. This solid is also sometimes called a rhombic prism. The term occurs frequently in science terminology referring to both its two- and three-dimensional meaning.
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Rhombus
In Euclidean geometry, a rhombus (◊) (plural rhombi or rhombuses) is a simple (non-self-intersecting) quadrilateral whose four sides all have the same length. Another name is equilateral quadrilateral, since equilateral means that all of its sides are equal in length. The rhombus is often called a diamond, after the diamonds suit in playing cards which resembles the projection of an octahedral diamond, or a lozenge, though the former sometimes refers specifically to a rhombus with a 60° angle (see Polyiamond), and the latter sometimes refers specifically to a rhombus with a 45° angle.
Every rhombus is a parallelogram and a kite. A rhombus with right angles is a square.
Wikipedia
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Rhomboid (noun)
A parallelogram which is neither a rhombus nor a rectangle
Rhomboid (noun)
Any of several muscles that control the shoulders
Rhomboid (noun)
A solid shape which has rhombic faces
Rhomboid (adjective)
resembling, or shaped like a rhombus or rhomboid
Rhombus (noun)
Any of several flatfishes, including the brill and turbot, once considered part of the genus Rhombus, now in ver=170601. from 16th c.
Rhombus (noun)
Snails, now in genus Conus or family Conidae.
Rhombus (noun)
A parallelogram having all sides of equal length. from 16th c.
Wiktionary
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Rhombus (noun)
a quadrilateral all of whose sides have the same length.
Oxford Dictionary
Rhomboid (noun)
An oblique-angled parallelogram like a rhomb, but having only the opposite sides equal, the length and with being different.
Rhomboid (adjective)
Same as Rhomboidal.
Rhombus (noun)
Same as Rhomb, 1.
Webster Dictionary
Rhomboid (noun)
a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
Rhomboid (noun)
any of several muscles of the upper back that help move the shoulder blade
Rhomboid (adjective)
shaped like a rhombus or rhomboid;
"rhomboidal shapes"
Rhombus (noun)
a parallelogram with four equal sides; an oblique-angled equilateral parallelogram
Princeton's WordNet
Rhombus Illustrations
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