Sentence:  Electronics has been applied to medicine for <WSD>many</WSD> years in the form of such familiar equipment as the x-ray machine , the electrocardiograph , and the diathermy machine . 
Meaning of the word marked with <WSD> tags:  a quantifier that can be used with count nouns and is often preceded by `as' or `too' or `so' or `that'; amounting to a large but indefinite number