Sentence:  Several <WSD>germanium</WSD> resistors have been thermally cycled from 300 to 4.2 * * f and their resistances have been found to be reproducible within 1 3 millidegree when temperatures were derived from a vapor pressure thermometer whose tubing is jacketed through most of the liquid helium . 
Meaning of the word marked with <WSD> tags:  a brittle grey crystalline element that is a semiconducting metalloid (resembling silicon) used in transistors; occurs in germanite and argyrodite