Etymology
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rhomboid (n.)

in geometry, "a non-equilateral oblique parallelogram," 1560s, from French rhomboide or directly from Late Latin rhomboides, from Greek rhomboeides "rhomboidal; a rhomboid;" see rhomb + -oid. Related: Rhomboidal. As an adjective, "having a form like a rhomb," from 1690s.

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Definitions of rhomboid
1
rhomboid (n.)
a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal;
rhomboid (n.)
any of several muscles of the upper back that help move the shoulder blade;
Synonyms: rhomboid muscle
2
rhomboid (adj.)
shaped like a rhombus or rhomboid;
Synonyms: rhomboidal
From wordnet.princeton.edu