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rhp
RHS
rhubarb
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rhumb line
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rhombohedron

rhom·bo·he·dron [ ròmbō h dròn ] (plural rhom·bo·he·drons or rhom·bo·he·dra [ ròmbō h drə ])


noun 
Definition:
 
six-faced prism: a prism with six faces, each one a rhombus

[Mid-19th century. <rhombus, after polyhedron]
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