| rhomb | (noun) a parallelogram with four equal sides; an oblique-angled equilateral parallelogram | Synonyms: diamond, rhombus |
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| rhombencephalon | (noun) the posterior portion of the brain including cerebellum and brainstem | Synonyms: hindbrain |
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| rhombic | (adjective) resembling a rhombus | - |
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| rhombohedral | (adjective) having threefold symmetry | Synonyms: trigonal |
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| rhombohedron | (noun) a parallelepiped bounded by six similar faces (either rhombuses or parallelograms) | - |
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| rhomboid | (adjective) shaped like a rhombus or rhomboid | Synonyms: rhomboidal |
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| (noun) any of several muscles of the upper back that help move the shoulder blade | Synonyms: rhomboid muscle |
| (noun) a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal | - |
| rhomboidal | (adjective) shaped like a rhombus or rhomboid | Synonyms: rhomboid |
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| rhombus | (noun) a parallelogram with four equal sides; an oblique-angled equilateral parallelogram | Synonyms: diamond, rhomb |
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