Interesting, perhaps in their effort to avoid short scientific terms they have substituted in longer more common words. For example describing a tumor as "an abnormal new mass of tissue that serves no purpose". http://wordnetweb.princeton.edu/perl/webwn?s=tumor The seemingly paradoxical result in an increase in understandability but a decrease in usability. Think of it as reading a passage where almost every noun has been substituted by a dictionary definition.