rhom·bo·he·dral \|rämbō|hēdrəl sometimes chiefly Brit -|hed-\adjective Etymology: New Latin rhombohedron + English -al 1.: relating to or having the form of a rhombohedron or a form derivable from a rhombohedron 2.: of or relating to the rhombohedral system • rhom·bo·he·dral·ly\-drəlē\adverb