Sentence:  What then is truth? A movable host of <WSD>metaphors</WSD>, metonymies, and anthropomorphisms: in short, a sum of human relations which have been poetically and rhetorically intensified, transferred, and embellished, and which, after long usage, seems to a people to be fixed, canonical, and binding. Truths are illusions which we have forgotten are illusions; they are <WSD>metaphors</WSD> that have become worn out and have been drained of sensuous force, coins which have lost their embossing and are now considered as metal and no longer as coins. 
Meaning of the word marked with <WSD> tags:  The use of a word or phrase to refer to something that it is not, invoking a direct similarity between the word or phrase used and the thing described (but in the case of English without the words "like" or "as", since use of those words would imply a simile); the word or phrase used in this way; an implied comparison.