Sentence:  By combining the talents of a medical man , Dr. Aterman , a biophysicist , Mr. Berkely , and an electronics expert , Dr. Zworykin , this novel technique has been developed which promises to open <WSD>broad</WSD> avenues to understanding life processes . 
Meaning of the word marked with <WSD> tags:  having great (or a certain) extent from one side to the other