3 random words.

 Gedankenexperiment

Definition: an experiment carried out in thought only About the word: Gedanken means "thoughts" in German. The term was popularized by Albert Einstein, who applied gedankenexperiment to his work conceptualizing the theory of relativity.  Triskaidekaphobia Definition: fear of the number 13 About the word: Every Friday the 13th, lookups on triskaidekaphobia spike on Merriam-Webster.com. The word comes from the Greek word for thirteen and the New Latin word "phobia." The origin of this fear is murky. Some trace it to ancient Hindu beliefs, others to Norse mythology, and still others to the Last Supper, after which Jesus was betrayed by one of the thirteen people present. Interestingly enough, known mention of the fear of thirteen in print dates back only to the late 1800s. Tintinnabulation Definition: the ringing or sounding of bells About the word: This word's Latin source, tintinnabulum, means "bell" and evokes the sound of one. The word was popularized in the mid 1800s by Edgar Allan Poe's poem "The Bells": "Keeping time, time, time, / In a sort of Runic rhyme, / To the tintinnabulation that so musically wells / from the bells, bells, bells, bells, / Bells, bells, bells...."