Anybody can post anything they wish to wikipedia. It's totally unreliable
This particular dismissal does not work for the subject matter of these particular articles and does not help your credibility, as if anything could at this point.
How about the US Geologic Survey? Would you take their word for it? http://pubs.usgs.gov/of/2004/1451/sltt/appendixB/appendixB.pdf
How about a university? http://esa21.kennesaw.edu/activities/rocks/rocklab.pdf#search='definition%20metamorphic%20rock'
Or two?
http://www.ux1.eiu.edu/~cfjps/1300/metoutline.html
Or three?
http://www.geo.utexas.edu/courses/420k/PDF_files/LABS/metlab.pdf#search='definition%20metamorphic%20rock'
Why don't you just admit it - you didn't know what you were talking about? Show a little intellectual honesty.