- rhomboid, rhomboidal - shaped like a rhombus or rhomboid; "rhomboidal shapes"
- rhomboid - a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal
--1 is a kind of parallelogram
- rhomboid, rhomboid muscle - any of several muscles of the upper back that help move the shoulder blade
--2 is a kind of skeletal muscle, striated muscle
--2 has particulars:rhomboideus major muscle, greater rhomboid muscle, musculus rhomboideus major; rhomboid minor muscle, lesser rhomboid muscle, musculus rhomboideus minor - rhomboid, rhomboid muscle - any of several muscles of the upper back that help move the shoulder blade