galvanization: either the work of covering with metal by the use of a galvanic current or the coating of iron with zinc to protect it from rusting
psychological feature: a feature of the mental life of a living organism
michelson-morley experiment: a celebrated experiment conducted by Albert Michelson and Edward Morley; their failure to detect any influence of the earth's motion on the velocity of light was the starting point for Einstein's theory of relativity