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1560s, from Middle French rhomboide or directly from Late Latin rhomboides, from Greek rhomboeides "rhomboidal; a rhomboid;" see rhombus + -oid. Related: Rhomboidal. As an adjective from 1690s.
rhomboid rhom·boid (rŏm'boid') or rhom·boi·dal (rŏm-boid'l)adj. Resembling a parallelogram having unequal adjacent sides.