Definition of rubra

(William S. Haymond, "Is Distance an Original...)

( 1 ) When an object was placed in the patient 's hand , he had no difficulty determining whether it was warm or cold , sharp or blunt , rough or smooth , flexible , soft , or hard ; and he could tell , simply by the feel of it , whether it was made of wood , iron , cloth , rubber , and_so_on .

(Robert A. Futterman, The Future of Our Cities....)

The big factories which are relatively near the centers of our cities - the rubber factories in Akron , Chrysler 's Detroit plants , U._S._Steel 's Pittsburgh works - often began on these sites at_a_time when that was the edge of the city , yet close to transport ( river ) , storage ( piers ) and power ( river ) .